Viruses, worms, Trojans, spyware and some adware are all examples of software that can cause damage and / or cause serious security problems once they get onto your computer.
At a pinch, to get rid of malware quickly, use a program that’s specially designed to find and remove the malware. Free examples include Microsoft’s malware removal tool, Malwarebytes, AVG, PandaCloud and Bitedefender.
A review of some antivirus / anti-malware software you can buy can be found by clicking here. However, it’s probably best that you get your IT support professional (that’s us!) to run through this properly for you, unless you are confident you know what you’re doing.