how to reboot the compaq?

That screen is usually caused by a problem with the File System. (Assuming that you have an anti-virus program it is unlikely to be virus.)

The solution is to boot from a Windows CD and run chkdsk /r .

BTW, I suspect that you don't mean "reboot". Booting is what you do every time your switch the computer on.

T
September 2011

Try this:
Click Start Menu
Click Run
Type in www.howtomendit.com or any url you might be able to access the internet that way. If you can there's hope. Could mean a personal hack or a virus has wiped 'something' needed. If you are able to access the net by the above way.....the quickest way is to head over to PCtools.com or openoffice.org and do a free virus scan then down load a patch if needed.
Failing that.....this link tells you how to do it in doss mode....better than I could relate....
http://wiki.answers.com/Q/Remove_virus_using_DOS

fedup68
September 2011