Here are my symptoms...
1)On my C:\ .exes with names like radzy.exe, redpy.exe & drsmartload1.exe keep appearing, if I delete them then they'll come back a bit later.
2)At startup I always have an applciation called mudes2 running, which tries to access the internet. Sometimes FaxMonitor also starts up for no obvious reason.
3)If I view the properties for my open dialup connection, I see it is constantly sending and receiving data as fast as it can. In the past, it sits idle unless I'm actively browsing.
Then today I installed the Firefox Ad-blocker plugin. Now I get these too:
4)Firefox keeps opening new tabs for ad-sites - it didn't before but blocked popup windows as I'd want it too.
5)If I close FF it opens itself shortly later.
6)I keep getting an URL called "spy-ware blocker" or similar appearing on my desktop.
I have Ad-Aware SE and Spyware: Search and destroy which cleared a bunch of stuff. But it seems they missed something...