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One of  the worst  problems faced by a computer user,  is when a computer with Windows operating system installed on it has a system error and display an error message "Illegal operation" on a blue screen, and the computer has to be restarted to prevent damage to the computer. The computer then has to be restarted, and all the work that was being done is lost.

Unlike startup errors which are indicated by a beeping sound , the blue screen of  death (BSOD) can occur at any time when you are working on your computer, without any warning. For example, it can occur when you are moving data between 2 folders and the data will have just disappeared from your hard disk!

The common causes for the blue screen of  death and the solutions to fix it are as follows:

1. Device driver problems - when new hardware is added to the computer, the device drivers may not be compatible. Try to get the latest updated version of the device driver from the manufacturer website. If it still does not work, remove or uninstall the new hardware and check if the problem continues.

2. New software installed may also cause a problem, so uninstall any new software. Viruses and spy ware can also cause problems, so ensure that you have the latest version of  antivirus software installed and check your computer regularly. How to  remove all spyware, adware  and  run a free antivirus program

3.Hardware problems. Computer components like the CPU, fan, RAM start malfunctioning after some time, especially if you use your computer for more than 10 hours a day.  Computers with AMD Athlon CPU's generate more heat compared to Intel CPU's and so this problem seems to be more common with these computers.

4. A simple configuration change which I made, after which I never faced the problem of  Blue Screen of  Death.

a) In most computers the RAM memory is shared between the system and graphics  - for example ,  for 128MB  , 96 MB is for the system and 32 MB is for graphics (default setting).  Reduce the memory for graphics to the minimum - 8 MB 

b) Change the virtual memory settings

My Computer ---->   Properties ----->Advanced ------> Performance -------> Advanced ---------> Virtual  Memory

For paging file size, select custom file size , with initial size 500 MB and final size 1000 MB. Save the settings. You can increase the paging file size further according to the software programs you use.

5. If nothing works, you can always reformat your computer hard disk and reinstall the operating system and software.