Squeaking mouse

[FishPolice]

heh my mouse keeps squeaking

Got a new Copperhead mouse. Works fine but sometimes when I move the pointer on the desktop I hear a high pitched squeaking kind of noise -almost inaudible. Took ages to figure out where it was coming from.
Could this be some kind of interference? Thought that was just something associated with wireless mice.

[edit] I should have mentioned the noise seems to come from the speakers not the mouse itself.

 

[FishPolice]

Hope to god it's not the GPU capacitors (buries head in sand & chooses to ignore what you just said).

I'll remove the pos creative 7.1 soundcard & see if that cures it.