Getting error messages when i access C: drive

I am getting error messages from like two days ago. When I try to open folders inside my C: drive the windows gives me this:
Window #1:
Windows Explorer has stopped working.
Windows is searching for a solution.
Then it stays there for a while thus forcing me to click cancel, upon clicking cancel a window pops up saying.
Window #2:
Windows Explorer is restarting.
I checked my PC for viruses and malware etc with 2 freeware programs and my Norton antivirus but that didn’t help at all. Please help in any way possible as I can’t afford to pay to fix this.
