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Have you guys actually tried reserving a Win10 upgrade from Win7 before sending this response?Hi Michael,
Check the build of Parallels Desktop installed, update it to the latest build, refer http://kb.parallels.com/111603
Install the latest build of Parallels Tools and check how it works.
I'm having the same issue too.
OSX Yosemite 10.10.2
Parallels 10.2.1 (29006)
Windows 8.1 works
Windows 7 with SP1 doesn't work
While Parallels hasn't addressed this yet, I think it's only fair to mention that this is just about "reserving" Windows 10. When July 29 rolls around, the update will be available to all (who qualify, obviously). All the reservation does is pre-load the software on your Windows 7/8/8.1 VM so that you can proceed without having to go online and hitting the expected traffic jam.
What I find odd is that my issue began when I created a SECOND VM of Windows 7 Pro using my licensed disk. I wanted to "preserve" my original VM and try out Windows 10 (I also have the "insider preview") so I created a fresh install and this is when the issue started. To recap: My *original* VM of Windows 7 Pro does not report the WDDM driver issue. Go figure.
I just attempted to reserve Windows 10 and the app is saying that the Parallels Display Driver (WDDM) is a critically conflicting piece of equipment. Any ideas on how to make this message go away so I can reserve?
Did you try to uninstall and reinstall the Parallels Adpapter driver from "Device manager"?