Good day guys.
I've had my Hp probook windows 7 lap top for a while. So recently I thought I should upgrade my ram from 2gig to 4gig for better performance. Then I thought about upgrading the windows to windows 8.1(my biggest mistake). After upgrading, my laptop worked fine for a couple months, then the wahala started.

My laptop started to freeze and glitch. While browsing, it would be refreshing by itself. When you exit the browsers and go back to the desktop, I.e where all the apps are displayed, it keeps refreshing. I can no longer do anything on it.

I'm not an engineer. So I tried to uninstall the windows8 and reinstall windows 7. I don't think I did that correctly. Now there are some sites I used to access without issues before but now, it displays "connection not secure". The laptop refreshing on its own persists.

I can't even use my laptop again its frustrating. I'm in lagos. Who else has experienced this and how.do I solve this and restore my laptop back to what it was?

I need suggestions please.