I get an error that says there is a problem with my C drive.
If that message popped out all of a sudden then it might sound like a malware infection. You should immediately use an anti-malware application and check for active threats. The recommended software for the job is Malwarebytes' Anti-Malware, Spybot - Search & Destroy or Trojan Remover which can be found for downloading on our website.
Also a scan with HDtune might provide vital information about the health of your hard drive.
