I have a new Win XP Pro SP2 install on the VM for Parallels 6. I have previously upgraded this to Win 7 successfully. However, when i try to do the same now, i get the following error message: Windows cannot install required files. The file may be corrupt or missing. Make sure all files required for installation are available, and restart the installation Error Code: 0x80070570 I am wondering what this is all about? I guess i can just use xp, but i am concerned that there is some kind of problem with my whole reinstall.