Seems like Jarvis decided he won't be anyones bitch anymore and quit
But really, true solution would be:
Boot up live CD of any sort (
Hiren's boot CD recommended);
Make backups of everything you want saved somewhere;
Reinstall windows;
Likely it's not a windows problem tho. When in the live CD with Hiren's check for bad sectors - there is an app in there to do that. If you get at least 1 red block, keep in mind that your HDD has started to fail and may crash into pieces some day.
Also try to browse the HDD from that liveCD (because it's Mini windows and all) and see if that does something like your normal OS does. If so, you can be pretty sure your HDD is failing. Check bad sectors anyway just to be sure.
Might be some other problems that can't be diagnosed like that... Listen to the sounds your HDD makes. If there's some clicking then you must make backups right now and ditch Jarvis.
Report everything here for further help