You might don't have any protection currently running on your PC. So, you are wondering you should scan your PC for once so that you can find out is there any problem running on your PC. A good news is that now you have option that you can scan your PC using the one of the oldest and popular virus scanner Bitdefender for free and without installing any software.
Just visit there website : Free Bitdefender Online QuickScan
Install the extension to your Firefox browser or Google Chrome and start the scan.