Here are two variations of a probable fix for your issue, depending on which
version of windows you are running:
1) For Windows XP, Service Pack 2:
At a command prompt, type:
netsh winsock reset
Hit enter, then restart the machine.
2) For all other Windows versions involved in this beta:
Follow the instructions in the following Microsoft Knowledge Base article:
http://support.microsoft.com/default.aspx?scid=kb;en-us;817571
After completing these steps, some applications which add themselves to the
Winsock LSP stack may need to be reinstalled.
It would also be helpful to the beta program if you could post in this
thread the contents of the "cleaner.log" file which is stored in the
directory the Microsoft Antispyware program is installed in. This will help
the team prevent this occurrence in the future.
(You should check those contents carefully to see whether there is any
Personally Identifiable Information present--i.e. stuff that could identify
you as an individual--it isn't likely, but it's a good idea to check before
posting)