Problem solved. I used DosBox. (never heard about DosBox before [img]redface.gif[/img] )
Yes initially I managed to install it without Dosbox . Just installed it
. I did try one of those programs that slow down the PC, but they would slow down not only scrolling speed but also gameplay and music, making it even worse.
Then I found DosBox, can't believe I hadn't heard of it before. Problem solved. Game runs just as it should. Problem of choppy movies solved too. Also managed to run some other DOS games that wouldn't run before.