Please do the following:
- download a free antivirus for testing purposes: Free AntiVirus
- uninstall the McAfee
from your system (you can reinstall it, if so desired, when we're done troubleshooting)
- remove any remnants of McAfee
using this free tool: http://service.mcafee.com/FAQDocument.aspx?id=TS100507
install and update the free antivirus, then check to ensure that the Windows Firewall is turned on.
- check to see if this fixes the BSOD's NOTE: NEVER
run more than 1 anti-virus, firewall, Internet Security/Security Center application at the same time.