From various websites, I’ve compiled this list of some things that can be checked:
1. First of all check if any rogue programs or services are running. Open a Run window (Windows Logo key+R), type msconfig and press Enter. On the Startup Tab, uncheck any entries that are unknown to you. Repeat this for the Services Tab. If you uncheck anything restart the computer and when it restarts, put a tick in ‘Don‘t show this again‘ as you‘re effectively doing a selective start up.
2. It’s probably not relevant these days but this only takes a few seconds to check. Open a Run window (Windows Logo key+R), type cmd and press Enter. Now type system.ini and press Enter. If under [drivers] there is an entry user=user.drv, you may have been hacked, so...