start with the simple stuff. pull the battery and power and flip the laptop over and reset the ram..over time i seen laptop ram walk out. on power up hit f8 go into safe mode if you can. if you can with network support go online and do a virus scan it may be a virus you pick up. if you cant try using a hirem boot cd and run a virus scan from it. hirem also hass a mini xp boot where you can boot from xp and back your personal data off the laptop. also most vendors charge a small fee for the restore cd or you can try ebay.