Most likely either an install issue (follow the tutorials available carefully, check WarhammerWeekEndtimes on youtube for a video step by step) or possibly an issue with your processor. Modern processors have 4, 8, 16 cores, which can be very powerful IF all of them are put to use. Medieval 2 is an old game, though, and only designed to utilize 1 core, which means a beastly 8 core processor might actually end up weaker than an old single or dual core one with more GHz in a single core.