mp3 player software affecting sound from speakers

hi
I bought an mp3 player recently and have just downloaded the software for
it. Then I had to download a program called something like 'active x control'.
The problem is that now my speakers are giving off a constant buzzing noise.
When I do a system restore to a previous point on the computer, the speakers
go back to normal but then I am left with no software for my mp3 player.
I am quite computer iliterate. if someone has a solution for me I would be
very grateful.
thanks