My graphics card is slowing down my computer

[superultramike]

I recently just installed a new graphics card a ASUS gtx 660 and my computer has been running much slower then usually. I've tried virus scans, and the drivers are all updated and up to date. My computer does recognized the card, and the power supply temp is running fine and can handle the card. I can open a web browser, but when I open a game or anything but a web browser It can take forever to open. Please HELP!

PC Specs: AMD A10-6800K 4.1GHz Quad-Core - APU
MSI FM2-A75MA-E35 Micro ATX FM2
Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600
Western Digital Caviar Blue 1TB 3.5" 7200RPM
Asus GeForce GTX 660 2GB
Corsair 430W ATX12V
Optical Drive Lite-On iHAS124-04 DVD/CD Writer
Microsoft Windows 8.1 (OEM) (64-bit).

 

[gwapito]

it sounds like a driver issue. Did you upgrade from amd gpu? Did you disable the apu(built in video from your cpu) from bios?