HEEEEEEEEELLLLLP.....please!

I´ve just bought an ASUS Geforce256 and everything works fine…EXCEPT…I can´t run Q3. It starts loading then jumps back to the desktop…I´ve installed the latest detonator drivers but It doesn´t seem to work anyways. Bummer. I´ve tried with the latest Opengl drivers too, but the same thing happens as described above. What am I doing wrong here ? Please help. Thanx in advance.