UAC is disabled. The issue seems to be with the install package, not any system setting. The setup runs fine without error, it just doesn't install the correct C++ redistributible package, but only on 2008 Server x86 SP2. We have 2008 R2, 2003 x86 and 2003 x64 servers and they all installed [properly, only the four servers on 2008 Server x86 SP2 had the issue.