I would suggest that you look and try (for free) the PARALLELS VM application.
You can put it in a mode that allows you to use both MAC and WIN applications seemlessly. You don't even know that you have the VM OS up and running. It is very fast and configurable. You can load all of your Windows apps in Parallels and enjoy the experience of both OS's without much, if any, degradation in performance. I've used it for about two years without any problems.
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