my kotor game on pc is running oddly slow…?

i just got star wars the best of pc game- including kotor (knights of the old republic), republic commando, jedi outcast, battlefront, and empires at war. all of them but kotor run fine.

when i click to start kotor everything is fine up until those opening credits (u kno it says lucas art and stuff u can click through). then the screen goes black and the music plays and i get the game mouse. sometimes if i wait long enought i get the game screne. once i had enough patience to pick a character but everything was sooo slow. why is this happening and how do i fix it?? thanks in advance
<3 padfoot

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