I tried to see if this was the problem but no. Even though I set my temp directory to c:\temp or whatever it still refuses to run I tried permissions I tried disabling network shares I tried running in safe mode without networking. Running 64bit home premium. I don't have this problem using x86 system with the same network permissions though I'm not able to add the updates to the slipstream as it says it needs to be in a 64 bit environment.