the scanner is reported as infected
didn't it rather say something like "scanner status: Infected" ?
This is a bit misleading, but rather means, that a virus/trojan was found.
avast itself was NOT infected..
to both of you:
Please work through the link in my sig "virusRemoval" and
- supply more detailed info, e.g path/filenames
- secure your System & IE, or this stuff will always come back
- use ad-aware, spybot, cwshredder to clean
- use KAV, Trend & RAV Onlinescanners to identify recurring variants..