have a dell latitude d810 with XP sp3. seem to have a virus which has disabled regedit and task manager. can't boot into safe mode - get a blue screen stop error 0x0000007B which says may have a virus. when I go to gpedit.msc to re-enable regedit and task manager, under user config:administrative templates:there is only windows components. it does not show system options.
ran malwarebytes anti-malware - found Backdoor.Bot, quarantined and deleted successfully