How to get rid of unwanted noise

[speedyb3]

Hi, I have been recording some guitar recently and I have been getting some unwanted noise. The microphone that I use is a Shure sm57, and I plugging that into a m-audio mobilepre usb which plugs straight into my computer. I have the mic at the spot that I want it so that I get my preferred sound as well as the amp set to the right volume, I also have my mobilepre set at max 'gain' so that I don't have to have the amp any louder. If I turn the amp or mobilepre down the noise goes away but then it is too quiet. I have also tried adjusting the audio in sony vegas pro 11 which is the software that I have been using but when I increase the volume it gets more noise. If I have it quieter and turn my speakers up it has no noise but then my speakers are turned way up which isn't ideal. How can I get rid of this noise without having it too quiet?

 

[one guy]

the noise your hearing is due to too much gain and therefore wont go away unless you turn down the gain on the interface just like you said.

 

[Armistice]

How "hot" are you tracking? Common newbie error is to track as hot as possible. Turn the gain on the pre down - it's a guitar amp, use its volume - you don't actually need much.