I can't imagine how installing some other program would affect the available resolutions in p99 besides changes to directx; but then I have many other 90s-00s games installed and none have interfered with my p99 installation. You're already proceeding down the path of resintalling I would first suggest. Please let us know how that works out.
Quitting seems a rather drastic measure - surely you could suffer playing at the OG 640x480?
-Mcoy
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