Radio Coming Through Speakers In Home
I take it these are powered speakers plugged into the computer?  They usually have very cheap, poorly-shielded little amplifiers in them which are good at demodulating radio and playing it out the speaker.  A mobile phone call nearby will typically also cause a bunch of beeping and "dirtdirtdirt" noises.

If your computer has a three-pin plug but is plugged into an ungrounded outlet or the ground is faulty on that outlet, that is a safety issue and may also contribute to the noise.

If you've got some $2 earbuds, plug those into the PC and see if you get radio noise.  If the earbuds are quiet and produce the PC sounds properly, then you know the problem is probably with the powered speakers.  If the earbuds also play radio, then the fault is either in the computer or its grounding.