So does it hang or does it just enter a (logical) loop. I.e. you select delete → error pops up → back to the virus alert → you select delete → … etc…

What if you just press OK? Does that help?

Also, what was the error message, exactly? Just “cannot process”?

I have also downloaded avast Cleaner and just finished running it. It found no viruses !....even when Avast has shown 4 infected files.

This is a very common misconception. The Virus Cleaner can only deal with a specific set of worms/viruses. By far not all of them!! It’s meant to be used only if you already know you’re infected by a virus that’s covered by the Cleaner. THEN it can do its job…

Hope this helps,
Vlk