540 wont boot up
The hard drive could be corrupt, this will cause the operating system to run the error checking. If you had a virus, and it infected any windows files, windows will check the files, but if it can\'t fix them, then it won;t run. You can try to enter safe mode, tapping F8 at boot, you should see a option to repair or restore. If not see if you can enter Safe Mode.
In safe mode you can go to start button, all programs, accessories, system tools, system restore.
You can also get a windows install disk, same version as you have, and put in the disk and hit F11, and boot from the disk, and run a repair from it.
You really should go to the website Avira, and download the rescue disk, burn it to a CD. This will run a virus scan of the hard drive before windows in DOS.
If there is a virus, it will kill it. But there is a chance it can\'t clean the virus and windows won\'t start.
The other option is to just erase the hard drive, not format, erase it with a program like Active kill disk. Then reinstall windows, all the drivers.
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