Turok 2 problem

I'm having a problem with Turok 2. When I start playing, it runs great, but then after about 10-15 seconds, it just freezes and it'll stay frozen for about a minute and return to normal gameplay and it keeps doing it over and over randomly. I searched the forum for any similar problems, but could find none. Can someone please help? Here are my computer specs:

3.0GHz Pentium 4 HT, Prescott core
1GB PC3200 RAM
ATI Radeon 9800 Pro AIW (drivers are up to date)
SoundBlaster Audigy 2

Thanks for any help

In addition to what I said, and I don't know if this matters, but whenever I fire the pulse rifle, it always freezes. Just thought I'd throw that in there.

I did have the cheats on and I started a new game with them off. So far it seems to be running fine. I guess it works fine as long as you type the cheats in like on the console. Thanks for the help!