Problem with CS: Source

I accidentally changed the screen resolution in CS:Source and now 3/4 of the screen is white so I can't see anything that I'm doing, so I can't change it back. I tried re-installing the game but that didn't help.
What can I do to get the game back to normal?

Thank you for any help

 

no one? anyone? please?

 

so.............does this mean no one knows the solution to my problem?

 

something simular happened to me.

Uninstall cs-source, and steam. dielete everyhting. onee done, uninstall graphics drivers. When uninstalled, download the newest drivers for your graphics card. Then install steam and source. That should do the trick, if not i dont know what to do.

 

wow, sounds complicated.
i'll give it a try
thanks a lot