If you don't get a response to solve the VP17 problem, I understand that there is a 10 days window to roll back to Windows 10 where, hopefully, VP17 will work again.
I should add that on my laptop with W11, VP17 opens without a problem.
I would advise anybody to wait with updating to Windows 11. From what I read there is still certain limitations. Windows 10 will still be fully supported for several years, so there's really no need to update to 11 at this point.
It's also worthwhile keeping in mind that Vegas Pro 19 does not as yet officially support Windows 11. And if Vegas Pro 18 and earlier need tweaks in order to support Windows 11, I wonder what the chances will be of those legacy versions actually getting updates. Quite unlikely I suspect.
@Monique-Matthews You might try uninstalling Vegas and then logging into your Magix account to deactivate your license before reinstalling. Also deactivate licenses there if the same machine is licensed more than once. Had to do that for vp19 on 1 machine and found on another that if I deactivated via the Vegas menu before upgrading to Win11, it went without a hitch. Apparently after upgrading to WIn11 the Windows internal computer id reports your machine as a new and different computer for software licensing purposes.
Maybe before upgrading to W11 it is worth using the old W7 Backup & Restore found in the conrtol panel. This way at least you have a safe fallback position should you find Vegas pro is not happy on your installation.