Please fill in your System Specs in bottom left hand corner of post. What is your computer or mobo make/model?
If you relied on the drivers
given only by the Windows 7 installer, there may be newer ones cued in optional Windows Updates. Check now, note their name and install.
If not, you may need to install the latest manufacturer's chipset for your computer or mobo model. We can look it over with you and help decide once we have the specs.