Have a lot of friends stuck with this spam and i have found some very nifty software that will kill it:
www.sysinternals.com/Utilities/ProcessExplorer.html (http://www.sysinternals.com/Utilities/ProcessExplorer.html)
(click the very bottom link)
This is nifty software but shouldnt be used without care (cos it can delete system files and kill your computer)
PM me if you have the block checker spam and i will post instructions.
John