smartassembly error

hi,
i’m using win7 32bit, avast free 5.0.545 and getting the error “This feature requires that {smartassembly} is available on this computer.” every time i start the computer.

the error comes with the avast symbol in the taskbar. when i click “ok” everything runs fine but the error appears every time windows starts.

i tried uninstalling avast and reinstalling, also i installed {smartassembly}.NET trial and uninstalled it. at every time the error kept appearing…

what can i do?
thx