Quote Originally Posted by unit187
I had this issue after I have downloaded latest nvidia drivers. I downgraded my drivers and freezes disappeared.
Sounds promising, I might give that a go.

I switched to a single WoW installation for the 4 clones but the problem persisted.

I was checking my performance as well and memory was at 50% with CPU 1&2 taking most of the load and 3&4 used now and then on spikes.

Still had a 50MB swap file going though. Not sure what Vista was doing with it when there was still 2GB free memory.