How To Fix A PC That Fails To Complete Bootup

Did your PC just fail to boot up completely ? This is one of the common problems which Windows users face time and again. Whenever this happens, you are almost always accompanied by a text error message (this error message is known as Boot Time Error Message). If you get a Boot Time Error Message, this indicates that the output from the graphics card and that the motherboard is probably OK.

Next you have to observe what message is on the screen when the boot procedure stops. In most cases they are self-explanatory, such as Invalid System Disk or Disk Error when you boot up with a floppy disk inserted in the floppy disk drive. Sometimes though, they can be more cryptic but will often give some indication of where the problem lies.

An error message can be produced by different parts of the system, depending on how far into the boot process the system gets before the problem occurs. Usually error messages are produced by the BIOS, as it is responsible for most of the boot procedure functions. However, other error messages are specific to the operating system and are known as Run Time error Messages.

There are many thousands of individual error messages - some more common than others. However, bear in mind that since the exact wording of an error message can be changed by the manufacturer of each system, there are a lot of variations on the same theme. If you are not sure that you can handle the system alone, it is advicable to take your PC to a professional.

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A Cheap Route to Robust LEDs

Organic light-emitting diodes (OLEDs) are steadily making their way into commercial devices like cell phones and flat-screen displays. They're fabricated with layers of organic polymers, which make them flexible, and they use less power and less expensive materials than liquid crystal displays.

The downside is that because the polymers react easily with oxygen and water, OLEDs are expensive to produce--they have to be created in high-vacuum chambers--and they need extra protective packaging layers to make sure that once they're integrated into display devices, they don't degrade when exposed to air or moisture.

MIT chemical-engineering professor Karen Gleason and MIT postdoc Sreeram Vaddiraju have developed a process that aims to solve the problems of high fabrication costs and instability for OLEDs while still maintaining their flexibility. Gleason's solution is a hybrid light-emitting diode, or HLED. The device would incorporate both organic and inorganic layers, combining the flexibility of an OLED with the stability of an inorganic light-emitting material. "The idea is to have a mixed bag and capture the qualities that allow inexpensive fabrication and stability," Gleason says.

Gleason starts with a substrate of electrically conducting organic polymer, which she creates through a chemical vapor deposition process in a low-vacuum chamber. It's the only step in the process that requires a vacuum, which should make the approach cheaper than conventional methods. For the light-emitting layer, Gleason uses quantum dots, nanocrystals of inorganic semiconductors; each quantum dot can be "tuned" to emit certain frequencies of light. Although quantum dots are inflexible themselves, they're so small--two to six nanometers across--that even arranging them side by side in a continuous film still allows for flex in the material.

While using quantum dots in light-emitting devices isn't new, Gleason's technique is. The problem is how to get the dots to stick onto a substrate in a uniform, even layer, without moving. Vaddiraju says that they use "molecular wiring." Instead of just laying down the quantum dots on top of the polymer substrate, the scientists use linker molecules between the layers to chemically bond the quantum-dot layer and the polymer together.

This "cross-linking" molecule between the layers is "a beautiful evolution of the present structures," says Vladimir Bulovic, an associate professor of electrical engineering at MIT and the first to demonstrate practical use of quantum dots in optoelectronic devices. Bulovic's research has depended on other methods of depositing quantum dots: dropping the dots onto a fast-spinning substrate, called spin casting, and, more recently, stamping them onto a surface.

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The perfect weapon against SPAM!

SPAM messages waste time, disrupt work and often carry malicious attachments or links that threaten your systems.

We have recently launched a SPAM filtering solution which uses technology which ensures that your emails are filtered of SPAM before they get to you, using the latest anti-spam technology with 5 layers of filtering, thereby producing a number of benefits.
- The load (or pressure) on your server to process all the SPAM emails is decreased, therefore you may see an increase in system speed.
- The filtering screens Email for malicious software - such as computer viruses and spyware, and phishing (fraud based emails).
- The service is relatively fast to set up and can be activated in 1 or 2 days with the results starting to take effect within 2 working days.
- The SPAM filtering process uses the latest technology (IronPort Mail Security)and is highly successful, ensuring that approximately 95% (or more) of your SPAM will be rejected or captured. As SPAM continues to grow as a business challenge this service evolves to combat the increasing new threats.

Kind of feedback we have been receiving sound like this:
“Daniel this is working like a dream – thanks heaps. The boys are only getting one or two spam a day if any.”
“The spam is a LOT better, thanks very much. We only received 2 in the last 2 days they both said spam in front of them.”
“I had only 1 spam email today, and it went directly into my junk email folder. I have asked around and everyone is getting the same”

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Firefox users gain location tool

Mozilla, the company behind the Firefox browser, has released technology that helps websites detect the physical location of computers.

The system will allow users, for instance, to find local restaurants when they travel to a new town.

The Geode project is an experimental add-on ahead of a full blown launch of geolocation technology in version 3.1 of Firefox.

Users will have control over how much location information they give.

It uses technology from a firm called Skyhook which works out a computer's location from nearby wireless networks.

Its so-called Loki system can determine location within seconds with an accuracy of about 10 to 20 metres.

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'Unbreakable' Encryption Unveiled

A Perfect secrecy has come more closer with the launch of the world's first computer network protected by unbreakable quantum encryption .

Quantum cryptography is completely different from the kinds of security schemes used on computer networks today.

The network connects six locations across Vienna and in the nearby town of St Poelten, using commercial fibre optic cables.

These are typically based on complex mathematical procedures which are extremely hard for people to crack

But quantum systems use the laws of quantum theory, which is supposed to be inherently unbreakable.

Anton Zeilinger, of Vienna University said : "Real breakthroughs are not found because you want to develop some new technology, but because you are curious and want to find out how the world is"

The basic idea of quantum cryptography was worked out 25 years ago by Charles Bennett of IBM and Gilles Brassard of Montreal University,,they were also in Vienna to see the network in action.

"All quantum security schemes are based on the Heisenberg Uncertainty Principle, on the fact that you cannot measure quantum information without disturbing it," he explained.

"Because of that, one can have a communications channel between two users on which it's impossible to eavesdrop without creating a disturbance. An eavesdropper would create a mark on it. That was the key idea."

Numerical key

From the detected photons, a totally secret numerical key can be distilled, which encodes the users' data much like the keys used in normal computer networks do.

The advantage is that no-one else can know the key without revealing themselves.

As we saw in the demonstration: when an intruder did try to listen in on the quantum exchange, photons became scrambled, and a rise in the error rate at the node detectors signalled the attack. The system automatically shut down without being compromised.

More importantly, the demonstration also showed that the network is robust.

If one quantum link breaks down, the connections can be re-routed via other nodes, much as phone calls get re-routed automatically through a telecoms network, so that any two users on the network can remain in continuous secure contact.

Dr Hannes Huebel of Vienna University, explained how robustness is now as important as security in the development of quantum encryption systems.

"We are constantly in touch with insurance companies and banks, and they say it's nearly better that they lose 10 million euros than if the system is down for two hours, because that might be more damaging for the bank," said Dr Huebel.

"So that's what we have to prove, that we have a reliable system that delivers quantum keys for several weeks without interruption, and then they might be more interested."

Polarised light

The final element of the EU-sponsored project (called SECO-QC) was the interconnection of different realisations of quantum cryptography.

There are many ways photons of light can encode a numerical key: through the direction they're polarised (like Polaroid glasses) for example, or the precise timing of their arrival.

Different schemes have different strengths and weaknesses, and a viable network would have handle whatever individual users choose to use, explained the project's director, Christian Monyk - just as a mobile phone network has to handle handsets from many manufacturers.

Quantum cryptography is a surprising outgrowth of recondite arguments that bounced around for decades about the meaning of quantum mechanics.

Albert Einstein, who discovered the quantum properties of photons of light - indeed, discovered the very concept of the photon - always resisted quantum theory's spooky behaviour, "God does not play dice", being among his oft-quoted objections.

"Real breakthroughs are not found because you want to develop some new technology, but because you are curious and want to find out how the world is," Dr Zeilinger said.

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