Cockroach control

Most people who are going to try this will probably already have been caught ... I installed Visual Studio 2012 Premium 90 Day trial shortly after it came out first, and didnt use it much as can be the case -- I had enough to be going on with and it didnt look very nice (as nearly everyone says).
I uninstalled it but it didnt really seem to go away, but I started using the Express editions and they worked fine, but eventually I thought it would be more efficient to have an all-in-one solution so I bought MSDN Professional. The trouble is that if a previous version of Visual Studio 2012 has not completely uninstalled, Windows tries to use the highest edition it thinks is installed, so I kept on being told that I had an expired Visual Studio 2012 Premium instead of the Visual Studio Professional that I had just being installing. It seems that Visual Studio 2012 is like cockroaches, one it gets in there is no way of eradicating it. I spent two days on the web looking for solutions and tried all but the most bizarre suggestions but to no avail. In the end I reformatted Windows 7 in its entirety and have spent a fair chunk of the last two weeks tryiing to get everything reinstalled and back the way it was.
Moral of the story: dont try out any versions of Visual Studio above your budget, its not worth it unless you are able to stick with the Express editions