The GIF plays on both my Mac and PC,
nitrobutler. Nice little GIF, by the way. I can't really help diagnose a PC system problem but you could d/l FireFox and see if the problem persists. Then you would know the issue is with something in the system (firewall, AdWare, SpyWare sofware, system setting?) or you would know it was IE if FireFox ran the animations.
For a second there I wondered if there was a setting in the PSG forum which might disable animations but I don't think there is.
As another little test, does this gif play? (there is a longish delay between rotations)
http://homepage.mac.com/wellesgoodrich/VR4.GIF