All HL1 games StartUp problem

I was messing with the video options in Blue Shift. I turned up the resolution and it crashed. When i started it back up it ran in software instead of OpenGL and the colors went to 16 bit. I tried making it 32 bit and it crashed then none of the Half Life 1 anthology games such as TF, Dod, opposing Force, HL1, and of course Blue shift will not work.

The error that comes up when i try to start it is... Fatal Error Failed to initialize authentication interface. Exiting... OK

I tried copying someone elses config file, it didnt work. then i uninstalled all hl1 games by deleting local content.. still they dont work

How can i default the video settings or change them without getting into the game?

You can change the video settings under config.cfg if I remember correctly. Just open the file with notepad and change the desired settings

i looked through there so hard already but what are the 16-bit/32bit, resolution, and software/openGL configurations called in there