Hello From time to time I need install some programs which I use only for few days for doing some small projects. I'm looking for an application which would let me install programs normal way on main Windows 7 but in some kind different zone - in separate environment. As you know all programs you install and uninstall leave some files, registry entries and waste some disk space. I don't want to get my Windows 7 installation rubbish. I've tried to use: 1) Sandboxie - it's good for small apps which don't require installing drivers but it fails with large installers like AutoCAD 2) VMware Player - allows installing everything but the idea to have virtual OS in main OS cause performance drops. Also it's annoying to work in 2 OS at once and switching between them all the time. Do you know any other way to install programs without making main OS rubbish?