Hi dundee,
There are a couple of stand alone scanners you could try besides Stinger.
I recommend you try DrWeb CureIT! first, and then Trend Micro Sysclean: go for the
Controlled Pattern Release definitions as these contain the most recent malware. You will need to temporarily disable avast! while scanning.
You can find links to both programs here:
http://www.geocities.com/dontsurfinthenude/antivir2.htmYou could also try Ewido:
http://www.ewido.net/en/download/As your IP is blocked I guess you'll be downloading from another computer, so don't forget to download the signature database so you can update the program when you install it.
If you do have Internet access, you could try some online scanners listed on the page above: I'd recommend Panda and Trend (if you don't use Sysclean) and also F-Secure, but you will need to disable avast! during a Panda scan.
Good luck!