I am concerned about the low level and the noise.
1. Someone else mentioned checking that phantom power is ON on your interface. If not, that is a problem.
2. Your mic documentation should give an impedance value. You can find the C214's specs at the link below. On the Scarlett, though, I don't see of a way to set that *but* you should double-check that you have the input set to LINE and not INSTRUMENT.
3. Your mic also has a 20db pad on it. In the on position, that would lower the output level. although it would not increase the noise.
4. Back to the stereo/mono thing, if you are only getting signal to one side but opening up the other side all the way, I can see how that might cause noise, although I've never had the issue. I usually get signal on one side and silence on the other. You can record a mic to a stereo track and just pan it Center. I do that all the time.
5. The only other issue would be a set-up problem with the interface. The Scarlett User Guide is excellent and you can find it online if you don't still have it.
In general, the symptoms you describe are usually caused by an input interface open too much but with a low signal coming from the mic. Please check phantom power and the mic pad. I have had this problem with a very low-level mic feeding an interface with very low gain, but with the mic and interface you have, I can't see how that could be a problem.
Dumb question: but you Scarlett is going direct to your PC and not through another interface, right? If you are using it as a mic preamp feeding another interface, there are lots of opportunities for level issues. Example: I have used a mic preamp to feed my VS-700 interface. It was fine but I had to get all the levels and setting right.
http://www.akg.com/pro/p/c214