Please let me know how you get on with DDU.
Ok, I've been busy, so I haven't had a chance to try yet. I'll let you know...
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I've been busy with other AMD driver issues in Xubuntu, but I finally had time to investigate this problem.
First thing I did was use DDU v22.214.171.124 to uninstall all the GPU drivers (in safe mode, as recommended).
Went to the AMD site, did the automatic install, and got version 17.6.2. Had the same problems with VLC and PowerDVD as mentioned in the OP.
Used DDU to uninstall drivers again. Went to the AMD site and downloaded the only other version of the driver I could find, version 17.4.4. After installing it, I still had the same problems.
Once again, uninstalled the driver using DDU. I can't find anywhere on the AMD site where there are older drivers, so I went to another web site where, thankfully, they archive old windows AMD drivers (not Linux, regrettably). I downloaded the latest 16.x they had, which was labeled as win7-64bit-radeon-software-crimson-relive-16.12.2-jan3. When installed, it reports it is version 16.50.2011-161223a-310015c.
This version worked. No problems with VLC causing windows 7 basic mode, and PowerDVD, all versions I have installed, are working again.
Incidentally, I have another computer running win 10, and it did not have this problem.
My conclusion: don't ever upgrade to a newer version of an AMD driver unless you have a copy of the one you are upgrading from, since if you need to revert, you won't be able to get it from AMD's website, and you can't always count on 3rd parties to maintain back copies.
Also, DDU is a great program, I'd recommend it to anyone.