Why was it necessary to go to the backup? Did you believe that Avast caused a problem? If so, what was it?

When i try to open Avast it asks me for a registration # and I don't have it thought i saved it but guess i didn't what can i do?
You can contact Avast support at support@asw.cz and request a new number, or just reregister. Your copy should run fine for awhile without it though.

techie