My AVG Free Edition antiviruse found this "c:\WINDOWS\system32\shell.dll" and next to it says "Result: Change?

Answer 1

I'm not sure what your question is but your issue isn't really major. That just means that one of your registry keys has changed, thats only a bad thing if you haven't uninstalled any files or made any changes... if you haven't done anything like that it could be a virus that isn't picked up in the rest of the program results.