Help...I updated my free AVG to 8.0 and had some problems with it. So performed a system restore to the old one and now I can't open it. I tried unintsalling teh AVG 7.5 and its says "Could not initialize AVG kernal interface."

I tried going into the control panel to uniinstall--did not work.
Tried SAFEA mode...did not work.
Tried using CC cleaner to run installer...did not work.
Tried systme restore back to v8.0...did not work.

PLEASE...I just wan tthe AVG to work or unistall!! What can I do? Thanks