Dolphin locks up my system?

[dYw.Fiend]

So I installed dolphin and tried to play Donkey Kong Returns for the Wii on my computer, and everything seems to work fine Graphics are good, no gameplay lag. Sound is a little bit buggy sometimes but everything else seems to be working good. How ever I can only play for about 5 minutes give or take and then Dolphin crashes and my system locks up.

Im running

Intel I7- 930
8 gigs of ram
32 bit windows 7
512mb Radeon HD 4850 graphics card.

Any tips or advice would be appreciated

thank you