Well first thing is that 2 Gb of RAM is a very small amount in todays computing world. I would suggest that you upgrade that to 4Gb and more if you can. I don't know how old your computer is. It may not be compatible for Windows 10. The only other thing I can suggest is, assuming you did the upgrade, try backing up your personal files and then do a clean install of Windows 10 using the Windows 10 media tool from here:-
Be aware though if you go down the media creation route you will lose all your personal files unless you back them up and you will need to reinstall all your programs.
Personally in view of crazyman's post, which is not in any way wrong, but I wouldn't be faffing around initially, assuming you did the upgrade. Do a clean install and then think about the other stuff. Thre have been problems with some drivers especially graphics drivers but you could end up spending hours and hours trying to find out what driver (if any) is causingthe problem. A clean install might just sort it relatively quickly.