Please have a look at these guidelines. Without sufficient details pertinent to your situation, we have no idea where to begin trying to help. In general, the more detailed your post is, the better the community will be able to help you. Additionally, you should be more detailed on your system specifications. Just as you can not solve an algebra equation with too many unknowns, we can not solve your issue with too many unknowns.
My Computer
Computer Manufacturer/Model Number
iBuyPower Chimera X58
OS
Windows 8 Pro x64
CPU
Intel Core i7 920
Motherboard
Asus P6T Deluxe V2
Memory
12GB (2GB x6) Triple Channel DDR3 1333 MHz
Graphics Card(s)
ATI Radeon HD 4870 X2 2GB GDDR5
Sound Card
Integrated Digital HD 7.1 Surround Sound
Monitor(s) Displays
24.6-inch ASUS VW246H 20000:1 Contrast, 2 ms response time,