Graphics error

When I play Swat 4 on my pc the grahpics go all funny. All my other games work ok. i.e Need for speed carbon.

Computer Specs
Processor: AMD Athlon™ XP 2400+
CPU Speed: 2019 MHz
Graphics card: GeForce6 6200 256mb
Gigahertz: 2.02
OS: Windows XP professional with SP2

What comes up.