Windows 7 VGA as Standard?

I upgrade my PC to Windows 7 and my VGA turn to Standard VGA Adapter. I got intel 865G Chipset onboard video.. Due this problem i'm getting lot of problems in full screen as well can't play game too... How i can resolve this with out downgrade os or adding optional VGA card? In intel site no win7 driver for my CHipset..|||Your graphics card isn't powerful enough to run the games you'd like it to. Buy a cheap dedicated graphics card.