l upgraded to yosemite and now get an error message when starting my Windows 7 VM. Windows dows not start and parallels tells me, that there is no access to harddisk 0 due to missing files or user rights. Therefore Windows dows not detect a boot device. Booting from the install DVD does not work either, as windows does not have access to the Mac harddrive. The VM then shrinks to mere 4MB. Recovering an earlier version f the VM did not work either, reinstalling the whole system did not work as well. A WIN 10 VM works without problems, but my WIN 7 VM surely does not. As I need the data and programms from this VM, being able tomhave acces to this VM is vital. Any ideas? Thank's.