I just installed Spybot 1.5.2 RC1 (1.5.1.19 beta) on my Vista system and found a serious problem. It appears that Spybot is not compatible with Kaspersky Internet Security v7.0.0.125 (KIS). Spybot somehow changes the code (registry?) associated with the firewall section of the program. I confirmed that Spybot 1.5.2 RC1 was the problem by uninstalling it and reloading KIS. Everything worked properly. I reinstalled Spybot and KIS was damaged again. I then uninstalled Spybot, Re installed KIS, and everything was fine. I then installed Spybot v1.5.0.13 and well. Their is a problem with the new version that needs to be investigated.