Looks like you're in for a re-installation of windows. Those are some grave/serious errors, mate. It'll take more time getting rid of em than just re-installing windows. Maybe its a virus that corrupted your basic windows files, like ntdll.dll, explorer.exe,...? Or maybe its just SP2, ive had some bad experience with SP2 myself. You can try uninstalling SP2 as well, nothing to lose really.