When playing Fallout 3 the game stalls frequently, ambient noises still play, but the display and controls lock up for around ten seconds at a time. This problem mainly occurs when encountering enemies but will also occur at random intervals, sometimes even during NPC conversations.

System Specs:
Windows XP SP3
Intel Core i3 530 2.93 GhZ
2 GB RAM
ATI Radeon HD 5670 with 10.12 drivers.

I have already tried the ini tweaks that are supposed to combat freezing with quad core CPUs to no avail.

Anybody have any idea how to fix this problem?