Can I install the same copy of Windows 7 on different Harddrive on Same PC?

"Short Answer, No. Slightly longer answer, you probably could, but you'll likely have licensing and activation issues to deal with.

An alternative method from the Startup profiles could be a simple batch script that cleans up processes before you start gaming. Create a new file on your desktop, rename it to ""Gaming.bat"", and put a line in for each unnecessary process:

TASKKILL /F /IM process.exe

The /F forcefully closes the process, so you can experiment with not using /F on some processes if you're afraid of lost data in those."

"Failing the dual booting option, something like this may help... http://www.allscoop.com/dotnet-software/service-manager.php

I used a similar windows service manager application years ago and it worked well. No recent experience though."