Yeah, I am running as an administrator. The last version (built 11/24/2010) I installed worked just fine when I installed it the same way two weeks ago. I tried reinstalling that version, but, of course it didn't work since it downloads the new s2bins.zip file.
**Nevermind** I just figured it out. I am embarrased. The McAfee access protection I have was blocking it... if an other user is having this problem the rules:
Common Maximum Protection:Prevent creation of new executable files in the Program Files folder
Anti-virus Maximum Protection:Protect cached files from password and email address stealers
need to be unchecked for this installation to work.