Problemo!:<

So when I start ET in full screen mode I get this error:

...PIXELFORMAT 5 selected
...creating GL context: succeeded
...making context current: succeeded
...WARNING: fullscreen unavailable in this mode
...setting mode 4: 800 600 FS
...using colorsbits of 16
...calling CDS: failed, restart required
...trying next higher resolution: failed, restart required
...restoring display settings
...window already present, CreateWindowEx skipped
Initializing OpenGL driver
...WARNING: fullscreen unavailable in this mode
...shutting down QGL
...unloading OpenGL DLL
...assuming '3dfxvgl' is a standalone driver
...initializing QGL
...WARNING: missing Glide installation, assuming no 3Dfx available
...shutting down QGL
----- CL_Shutdown -----
RE_Shutdown( 1 )
-----------------------
GLW_StartOpenGL() - could not load OpenGL subsystem


Can't go to small screen since ET starts then I get this error before I can do anything and i have to quit ET again,

any ideas before I reinstal?