Colours dont seem right...

Well i have moved back to Windows7, and lefted Snow Leopard for awhile, i am having issues with the colour and maybe refesh rate on my monitor. The dark colours i can see it refreshing, and some colours are not showing too well. But if i boot into windows i see no problems and everything is fine. Ill be getting a New quadcore/case/memory/hd/blue ray/monitor and speakers. While i have some info about the soundcard i wish to use, ill wait till i have my system updated with new hardware.