Go to start, type 'device manager' and then probably 'display adapters' Find your Graphics card and then 'update drivers' This should solve it.
A good clean can also solve a lot. Find 'disc clean up' and follow what it says. Download 'malware anti-malware' and run same. There is a free version on CNET. Very good for getting rid of malware. See if all this helps. Finally, if all this fails, put your question in the google browser. There are a lot of videos that will answer you. I've learnt a lot that way.