Тема: REPAIR HELPS: How to solve computer automatic restart
The computer restart loop problem is often the result of a device driver, a bad system component or hardware that causes a Windows system to spontaneously reboot in the middle of the boot process. The end result is a machine that can never boot completely.
If you can boot the system properly in Safe Mode -- press F8 at startup -- there's a good chance whatever is wrong revolves around a device driver. Safe Mode loads its own set of fail-safe drivers, which are minimally functional, but more importantly, stable.