Just play it either with distortion or set your monitor to do 1:1 mapping so you get black bars.
And be glad it runs. Seriously, just go with it running and play it however it will work.
I'm glad I have 3 computers available to me otherwise I could never have replayed KOTOR1 and 2, since neither worked on my desktop, and one worked on one laptop, and the other on my old laptop. (All different graphics, OS, processors etc)
And they still both liked to crash all too frequently even when I did get them working.