the following phenomena occures on my computer, running win xp rl2 & nod32: 1. During web browsing, i got 4 messages from nod32, saying that there was an attempt to change few system files. According to the message, these attempts failed, but i must reboot the system in order to complete their removal. 2. At that time the system seems to work ok. 3. after finishing my work, i rebooted the system. 4. Since then, i have the following situation: the system trys to boot, I have the windows logo on screen. Shortly afterwards, i get a sound of a physical shotdown of my hard drives, like the sound when the computer powers off. the system goes back to the bios screen and then waits until the hard drives begin to operate and then it tries to boot again. the same procedure goes in an endless loop. 5. any boot option (inc. safe mode) give the same result. 6. I installed another copy of windows, and from this copy the system boot just fine, so its not a hardware problem. 7. Have anybody experience the same thing and knows how to correct it?