QuickBooks for Windows products are designed from the ground up to work on a PC with Windows installed. Using PC emulators such as VMWare or Parallels to run QuickBooks for Windows while using Mac may decrease application performance in terms of speed and not all features may work as they were intended.
Please be aware that Intuit has not tested the use of a QuickBooks for Windows product on the above mentioned PC emulators. We encourage you to research this approach to see whether it will work for you.
On the other hand, in Mac OS X, a utility called Boot Camp is available that lets you run Windows. Please see this Apple article for more information.
Some of the differences between the Windows version and Mac version of QuickBooks can be found here: QuickBooks Windows vs. Mac: What's the difference?