‘Read only issue’ expanded

One day windows decided to make all of my folders and files read only. This caused some major issues. I tried to virus scan the computer and it came up with nothing.
Reluctantly I reformatted the hard drive and reinstalled windows. The problem was still there.
I then took another hard drive and formatted that and installed windows. This did not solve the problem either. Now, not only is the computer setting all folders and files to read only, and resetting it to that if you try to make it not read only, the cpu is now going to 100% when you try to move an open window to the side. Any help with what to do would be great. Thank you in advance. Jason