error in unreal tournament 2003
when i click the icon and tell it to load i get this error
"UT2003 Build UT2003_Build_[2002-09-13_17.31]
OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro-class processor @ 908 MHz with 639MB RAM
Video: RADEON 8500/RADEON 8500LE (6025)
Assertion failed: RenDev [File:WinViewport.cpp] [Line: 536]
History: UWindowsViewport::OpenWindow <- UGameEngine::Init <- InitEngine"
i have a duron 900
it ran fine on my last install of windows, but no matter what i try i get this error now.
btw i am using factory drivers as they give me the best performance, could that be the problem?