Question PC problems Help!

Mar 4, 2019
1
0
10
So my gaming pc is having problems. It started in February when I turned on my pc and there was a black screen that said Registry problems. My pc started to lag a lot and the lag is getting longer every time I turned on my pc. When I tried to open any software or programs it always freezes and then windows also freezes. I look online and it said that to fix it all I have to do is format it so I already format it (windows 7) but the problem still persist. My brother suggested that I upgraded it to windows 10 and I did but the lag, crashes and freezes are still there so what do I need to do?