I had the same problem. It may be related to UAC in Windows 7. I was able to resolve the problem using the information in this post. See the last reply in this post. http://forum.uniformserver.com/index.php?s...p;hl=windows+7# Basically do the following: Go to %USinstalldir% Rightclick on start.exe Select "Run as administrator". I did this and US 5.6.12 runs under Windows 7.