Cannot delete Windows EXE Builds

Hi,

Every time I make a Windows Build using the latest Unity 5, I cannot delete the EXE file AFTER running it and quitting. When I try to delete, I always receive a Windows Explorer error that says ‘The action can’t be completed because the file is open in System’. This error happens even on the simplest of scenes (like the default scene).

Can anybody help me regard this?

Maybe antivirus is locking it ?

Thank you for your recommendation. It was related to the anti-virus, Bullguard.