constant restart and can not formet it any thing in windows xp

[shs]

constant restart and can not do any thing in windows xp before restart its show blue screen and then restart

 

[hang-the-9]

Try running a Repair setup from the XP disk, if you don't have one, borrow one or get a copy from the PC vendor.

If this happened after you installed something new, remove it from the system and see if it starts up normally then.