How familiar does the following sound? Your computer was working fine, but then suddenly started locking up (aka hanging or freezing), rebooting itself (crashing) or shutting down spontaneously? If you know only too well what I am talking about, then read on! Performing the simple steps below can fix the majority of lockup cases.
1. Check for recently installed software or hardware.
If the lockups started to happen after you installed a new peace of hardware, new software program, or new drivers, uninstall it and see if the problem goes away.
If you don't know what software you installed recently or don't know what changes made your computer crash, you can try System Restore which comes with XP. It restores your computer to a previous working state. Run the application from here: Start Menu -> Programs -> Accessories -> System Tools -> System Restore.
2. Run your antivirus program.
One of the first things to do in the case of sudden lockups is to run your antivirus program. Check your antivirus manufacturer's website for updates and latest virus definition files. (This is absolutely necessary, outdated antivirus is not going to be of any use!) If you don't have antivirus software installed - or if updates are unavailable - run one of the web-based antivirus scans that some major antivirus vendors like Trend Micro are offering for free.
3. Run some good spyware removal tool.
If your machine is not infected with any viruses, it is still possible that it has some harmful adware or spyware is present. Download and run some good spyware removal tool such as AdAware, Spybot S&D or SpywareBlaster. These tools are superb spyware prevention tools and provide regular updates.
4. Check for free hard drive space.
When no viruses are found, check out free hard drive space on drive C:. Make sure there is more than 20% of free space available; low disk space can lead to random lockups.
5. Check for overheating.
Overheating is another known cause of lockups. It can be caused by problems with fans inside the case, dust buildup, or other cooling problems. Make sure the power supply fan and CPU fan are running and free of dust buildup. You can check the temperatures inside the case by running Motherboard monitorhttp://mbm.livewiredev.com
- make sure the temperatures are within the preset limits. Be very careful while cleaning inside the computer case (use plastic vacuum crevice tool) and NEVER OPEN THE POWER SUPPLY CASE as it contains high voltage.
6. Check the hard disk.
Check the hard disk - it is possible that its logical structure is corrupted. To check the disk for errors, right-click on the disk C: icon in "My Computer", select the "Tools" tab, check all check boxes in the "Check disk options" field, and press the "Check now" button. It should ask whether you want to schedule the check next time you restart your computer - answer "Yes" and restart your PC. The check will be performed automatically after startup; it can take a while, so be patient. The program will attempt to fix some problems automatically – however, if the hard disk is failing physically, it will need to be replaced. It is also a good idea to run Disk Defragmenter (located in Start Menu > Programs > Accessories > System Tools) to optimize data placement on the hard disk for increased performance and reliability.
7. Check the memory.
Sometimes random lockups can be attributed to the computer memory (RAM) starting to fail. You can test the memory by running Windows Memory Diagnostic that can be downloaded from Microsoft Online Crash Analysis If memory problems are found, try re-seating the RAM (pull it out and plug it back in). If it doesn't work, replace the defective RAM.
8. Check for other hardware problems (advanced users).
More hardware-related problems can be diagnosed by running hardware tests from the Ultimate Boot CD that can be downloaded from Ultimate Boot CD - Overview However, you should only use it if you know what are you doing - some programs on that CD can be dangerous when used inappropriately (for example, some of them can wipe the contents of your hard disk).
9. Update Windows and drivers.
Some lockups can be caused by outdated software components. Everyone should ensure their Windows Updates are on automatic (Control Panel -> Automatic Updates). Set and forget - Windows will remember for you. (As an alternative you may want to run a windows update: http://windowsupdate.microsoft.com). Also ensure you regularly update all your hardware drivers from vendors' websites. These contain bug fixes and resolves compatibility issues with other hardware.
The above steps will help diagnose and eliminate the most common causes of lockups. Hundreds more of other possible scenarios need to be dealt with on a case-by-case basis, as it all goes down to your particular computer configuration. Asking in troubleshooting forums/newsgroups should help you figure out solutions to not-so-obvious lockup cases.
regarding overheating, does the amount of dust within the cpu fan area contribute to random lockups?
my cpu fan speed is at 0rpm at startup from the bios settings itself so i was jus wondering whether is my cpu fan faulty or there is too much dust?
I agree that DUST is a cause for FAN freeze specially if it penetrates thru is mechanism inside the FAN. then regular cleaning of your CPU will prevent that.
I am personally a victim of DUST... I cann't even count how many times I've been to computer store for replacement.
Excellent article administrator,
For the last 6 months my Vista has been unreliable at boot-up sometimes presenting a black screen with an endlessly flashing cursor top left, requiring me to restart several times to progress past it. Also during normal operation freezing completely at odd intervals mouse-cursor stuck, ctrl-alt-delete fails, only way out was to knock power off!
Remedy - turned out to be removing both RAM memory strips, running a pencil eraser along the copper strips (a tip I saw ages ago somewhere, quite why an eraser has magic powers, no idea! Figured it could do no harm) and reseated RAM back into slots. Hey presto fixed. Now running for 3 weeks without a hitch.
If you get these particular symptoms 'tis worth trying first. Administrator what do you reckon is this eraser trick worthwhile or a fairy-tale?
(Psst, jdedrzea. Start a new thread. Not only does it cut confusion about who is responding to what, it also makes it easier for people with the same problem to find the discussion.)
Troubleshooting Computer Freezes / Lockups 
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