Ubuntu Sverige

How do I switch from ubuntu to windows without restarting? I currently have two hard drives, one has ubuntu the other windows. At the moment I restart my PC and choose a different primary boot drive to switch between the two. Is there any way to switch between them without restarting my PC, or reinstalling either?
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Please notice this is a swedish talking forum (or writing, hm). Ask your question @ ubuntuforums.org.

I will however give you a very short answer. Install windows in a virtualbox or vmware. Not sure if you can boot from an existing installation. But if you want more help, use swedish or go ubuntuforums.org.