If you buy the boxed version of Parallels it comes with a proprietary USB cable that allows you to migrate a perfect copy of your current OS configuration and files to the iMac. That way you don't have to buy another Windows install DVD. It's genius and works like a charm! You won't have to reinstall anything. It's all right there on the iMac. And the beauty part about Parallels is that it runs in a windows, ie. it doesn't take over your machine. You can run the Mac and Parallels together. I've been using it for years. It will save you hours and hours of reinstalling all of your software. Check it out!