Parallels virtual Windows environment

When I bought my Mac, I actual never had to give up anything from the Windows world.  I installed Parallels, a software that allows you to run Windows applications side-by-side with Mac applications.  You install Windows on a virtual computer that Parallels creates.  I installed Windows 7 (64 bit version).   Most of my problems still come from the Windows side but it is good for websites that only run on Internet Explorer and applications that only run on Windows.  I'm trying to move everything over to Mac but for those programs that are only on Windows, it is great to have an option to run it right alongside my Mac applications.