I have a pvm created in Parallels 4 which ran fine until I upgraded my MacBook Pro to Lion OS 10.7.5 The MBPro (late December 2006) can only go to Lion and is maxed out at 3 GB RAM. My research seems to show that the best version of Parallels to upgrade to in my case is Version 7. Version 7 is optimized for Lion and does not have the larger RAM demands of later versions. The PVM is Windows 2000 Professional and contains some software I no longer have the discs for. My question is: Will the pvm created in Parallels V 4 operate in Parallels V 7 ? Are there any specific order of installation/set up guidelines I need to follow to get the pvm to run? Thanks in advance for your input.