I had problems too when installing Visual Studio 6. Installation crashed and my installation folder was full with crap. The Source Safe seemed to cause crash - at least its folder was fully messed up. I run scandisk and deleted that folder. Then I manually cleaned registry (big job!). I then intalled only Visual Basic. It went ok. Then I used add/remove components and added Source Safe but only with support to new database format - without backward compatibility. It went ok too. That was enough with me. The conlusion I got was that backward compatibility of Source Safe caused problems...