Originally Posted by name='nathan'
Sounds like a corrupt profile, windows can sometimes fix it (which sounds what happened above). Try creating a new profile and use that for a while, see if it still freezes.
It can be anything from it clearing up temp files or similar.
Key is that when it does this sorta thing u can hear or see the hard drive thrashing away.
If it starts doing it too often, it can be time to start tidying up, doing some housework - or just simply turn indexing off