Looking at getting a new base model 13" MBP but I need Windows to run an older program I have. I have a retail purchased copy of Windows 7. Will the cheap (non subscription) version of Parallels work OK along with Windows 7 on the base MBP? I used Bootcamp before but Bootcamp doesn't support Windows 7 anymore. I have no experience with Parallels. Any helpful insight on this would be appreciated.