I've never been a computer nerd in spite of having used them since the early 80's. So I always enjoy tips from Kim Kommando – even some of those which I don't understand. The five she discusses are:
1. UNEXPECTED REBOOTS
2. BASIC SOFTWARE TROUBLESHOOTING
3. BASIC HARDWARE TROUBLESHOOTING
4. POP-UP ADS AND ODD MESSAGES
5. GETTING THINGS GOING AGAIN
I can't remember how many times I've used #5. Anyhow, details are @ 5 common computer problems solved | Fox News