How to remove a virus or malware
Malware removal is sometimes a difficult task, however there are reputable programs used to remove or prevent Malware.
Malwarebytes is the industry leader for removal found here
https://www.malwarebytes.com/ (Windows) https://www.malwarebytes.com/mac/ (Mac)
The free version has no active protection but does a successful job at removing malware already on your system
I recommend looking at this internet thread for a more detailed guide of difficult to remove Malware!
https://www.reddit.com/r/techsupport/comments/33evdi/official_malware_removal_guide/
The solution with the best results is to reinstall your operating system (Windows/Mac/Linux) from scratch (Do remember to backup your important documents/photos/files!). This can be done with a CD/USB with the Operating System on and reinstalling with that.
System Restore is not a suitable solution to stop malware (and sometimes makes the problem worse)
Please note: an AntiVirus or similar software will not always with 100% accuracy find malware. Do not rely on them to stay safe, use your common sense and knowledge to avoid a bad situation!
Again if in doubt contact someone you know for advice!