Try Booting In Safe Mode, And Re-Installing The CPU Driver (Instructions Below)
After Booting Into Safe Mode;
1. Go To Control Panel
2. Open "System And Security"
3. Open "System"
4. Open "Device Manager"
5. In Device Manager Click On The [+] Next To Processors
6. Right-Click On One Of The CPU Listings
7. Under The Drivers Tab Click Uninstall
8. After The Uninstallation Reboot
I managed to fix the same problem out this way when I went from my Pentium D to my Q6600. Give it a try!