ati radeon 4800 series catalyst center not loading?

ive asked questions before about problems with windows alt tabbing out. i asked a friend and he said if i have an ati card then it interferes with windows' resolution. basically what happens is any program i have open will alt tab between 10 and 30 seconds. as a gamer, this is very frustrating. i went into display settings and im playing around with things and i see the catalyst control center. it then comes up with an error message. i finally recognized this error message and it has been coming up every single time i load up my computer. heres the message:

Could not load file or assembly 'CLI.Implementation, Version=2.0.3427.27797, Culture=neutral, PublicKeyToken=90ba9c70f846762e' or one of its dependencies. The system cannot find the file specified.

this comes up every single time i load my computer, and it also comes up when i try to open the advanced settings with catalyst control center through program files. please help!