Unable to run opengl

Hi, I have a geforce 2 ti, 700 mhz Athlon, 20 GB hd, SB live!, and 256 MB ram. In every game i attempt to run it says that my hardware (graphic’s chip) is not supported by opengl or “could not load open gl subsystem”. I downloaded setupgl and ran it… it said that my chip was no supported. I know for a fact a gf2 is supported. Please help me