Are both of these having conflicts?
After installing RS:Raven shield my quake 3 is running so slow.
(Like playing it in a pentium 1 or somethin.) Cant even go to the single player button or options cause it's so slow.
A file called config in the Quake3 base folder could of become corrupted, try deleting it and running quake3. (note: you will lose your graphics config/sound/control) but this can easily be setup again.
I went and installed DX9 then new ATI drivers and my graphics in general were screwed. Programs when being opened or minimized would scroll really slow, and Q3 wouldnt even load. I ended up deleted my ati drivers totally and reinstalling them again with no success. With the new ATI drivers still installed I then went and installed DX9 again and everything was fine.
Might be related to your situation, but I guess I had problems with DX9 and or Catalyst drivers.