I was FORCED to install Windows 8 to my IMac 24 inch running Mountain Lion OS via Parallels 8 for the following reason. I receive an error message stating that some files cannot be moved and that I must create a single partition formatted Mac OS X Journal Extended. In short. the Windows 8 partition could not be created. The problem is, my drive is ALREADY a single partition in the aforementioned format. I succeeded in installing Windows 8 on my other IMac via Boot Camp with no problems. The only difference between the two IMacs is the former runs the Mountain Lion OS while the latter runs the Lion OS. Any suggestions? I LOVE Windows 8, however, there is significant performance degradation when running Windows 8 within Parallels. Please help! Thank you in advance.