Upgraded 9 to 10 - Now get critical error trying to start up Windows 7

I just upgraded my Parallels 9 (latest update) to 10. When I click to start up my Windows 7 VM, I get "A critical error occurred with Parallels Desktop." I've submitted the generated reports a couple of times.

Any suggestions to try to get my VM working again?

Thanks,
Peter

 

Ok, I got it started in 32-bit mode! It churned quite a while before it started. It's installing the Parallels Tools now. When it's done, I work in Win 7 a while, and then shut down and try to start in 64-bit.

 

Yes, now running fine. I've restarted a few times. Problem seems to be resolved.

 

So how did you go about getting it running? I'm experiencing the same error

 

World appreciate the exact you took to solve the issue.

 

Start Parallels
Open the settings window
Select the Hardware tab
Select Boot Order
In the Boot Flags box, enter: vm.app_mode=32
Now try starting your Windows VM (it started up for me, but it took a while)
Shut down Windows
Go back to the Settings Hardware tab, and clear the text from the Boot Flags box
Start Windows again
Everything was fine for me after that.