I would say away from Uniblue registry and other Uniblue sofware.
Don't have any atttoolbar.dll on my computer and I got the FREE antivirus software for Windows with anti-spyware - avast! Home Edition.
http://www.avast.com/eng/avast_4_home.html
I have not had to get a new license key yet so don't know how good or what trouble there is but I would think you just register again like I guess your trying to do.
But the atttoolbar.dll makes me wonder. Did Avast want to install a toolbar?
Do you have the atttoolbar.dll file on your computer?
It is a atttoolbar.dll belonging to AT&T Toolbar from AT&T
http://www.google.com/search?hl=en&q...earch&aq=f&oq=
Did you have the toolbar and uninstall it. If so Avast my have it in a file or regisrty till and now can't find it to renew things.
You could post over at
http://forum.avast.com/