Hey Buddy, I noticed some of the harsh replies you have been getting. I received 1 C as a freshman and I debated for a long time if I should retake it. I called each school about applying, talked to my advisor, talked with a PT and concluded that 1 C (even in a pre-req) did not kill my chances of acceptance. 2 of the schools took the highest grade earned, and 3 of the schools averaged the two grades...you have to call the program.
My point is, don't loose any sleep over that 1 C like I did.