Multiple XP accounts

The primary protection in SpywareBlaster (that being the kill-bits to block spyware related ActiveX controls) protects the system as a whole, but the cookie and restricted zone protections only work for the user that ran SpywareBlaster. However, you can run SpywareBlaster on each user account and tell it to enable all protections. The only possible problem is that you might have privilege restrictions depending upon how securely the other user accounts are set. If those other user accounts are highly limit, then they may not be able to run SpywareBlaster. Try it and see.