Discovering the Visual Studio Team Systems features from the December Community Tech Preview (here more on Installation) , I just realized that the code coverage features is generating temporary batch files which an installed anti-spyware program could just block. In my case AntiSpyware was blocking qtsetup.batwhich is generated and started by VSTS code coverage. This is just the case for the current December CTP and the current spyware definitions for AntiSpyware.