I checked it out and want to go to that. However, it says that you can't run it with other firewall sotfware. Would that new Spyblaster from Windows be considered a firewall?
If you are talking about the Spyware cleaner software that MS just released (which used to be Giant Software) then, no. That is not a firewall. However, if you are using Windows XP, I believe that there is a built in firewall that can be enabled and disabled. I'm not certain. I don't use XP. Perhaps someone else here would know for sure.
I use Outpost along with SpywareGuard by JavaCool software. Both load at startup and run in the background nicely.