|It may not be a virus. It may be either spyware/malware or just a simple software config issue. |
First see if you can open your AV in safemode. If yes, then go into msconfig and disable everyrthing in the startup tab. Reboot into normal windows and see if any difference. If yes, then may be a software conflict. If there is no difference then D/L Malwarebytes and run in safemode.