You are living on borrowed time if using avast 4.8, whilst there is no fixed date for the end of support for 4.8 including VPS updates, it really can't be that far out.
Support for win9.x, winME was original meant to cease at the end of 2009 and that really is the only reason you should still have 4.8. The only reason that didn't happen is 4.8 was still supported and inadvertently win9.x, winME.