Get Norton off of there. Replace it with Microsoft Security Essentials - it's free, and it's solid.
Run Windows Update - when asked for "Quick" (or is it "Easy"?) versus "Custom", choose "Custom", then look for any driver updates and install them. Reboot and see if the issues persist.
Run Windows Update - when asked for "Quick" (or is it "Easy"?) versus "Custom", choose "Custom", then look for any driver updates and install them. Reboot and see if the issues persist.