Computer error loading operating systems

I accidently stated a c drive disk clean up and I turned off my computer after seconds of stating the process because I realized that it would delete all my programs and files, and it would not let my cancel the process. So now when I start my computer the error loading operating systems message pops up. I have been reseaching this message and everything states that you need to re-install the bios. My real question is, did I loss my programs and files when I did this disk c clean up for a few seconds, and will the re-install of the bios affect lossing my files and programs?