Hello Deary,

After booting my Window XP PCs, I discovered that it won't come up with startup menu nor with any icons on desktop as normal. All I could see is blank blue screen. For now I could only check some documents up using ALT+CTRL+DEL which shows 'Windows Task Manager' -> File -> run.

Can someone help ?

Demystifying the 'Blue Screen of Death'

You can read here all about the Blue Screen of Death. This should answer your questions (hopefully).