Stopped using both Parallels and VMWare Fusion a while ago. Paid for both- but both of them screwed up too many associations in OSX (Parallels being the worst of the two). They would cause some Microsoft Word documents to open in the emulator (even though I had a current copy of Word in OSX). When I want emulation I want isolation: so I use Virtual Box which I consider better as it has fewer host operating system hooks.