Roland FA-101 hums in my monitors! it goes away when I interact with windows!

You have a ground loop. Probably due to a bad connection somewhere in the cabling.

It goes away because soanr is out of focus when you go into windows. If you enable share drivers with other programs, the hum wont go away...
The others have your answer. Bad cables, a ground, not using balanced/shielded cables could all be your problem.
Try pluging into another wall wart on a different circuit and/or replace your cables with balanced cables
Cj

OK, I would think this initially as well, but I was using all of the same equipment and cables with a much less expensive(and sensative for that matter), Lexicon Omega audio interface with no noise at all. Please DONT tell me that I have a bad interface. I hope it is that the FA is more sophidticated and technical requireing more expensive and technical cables or something!!! I am not using blanced TRS, so I should?

I honestly don't think that using balanced cables will eliminate this problem, if it was the cables then the noise would not stop just because he changes the focus to windows or moves things around on his desktop. If the cables are picking up 60 Hz line noise it will not stop because of something he is doing with the computer. If the screen is on it is on, it should not matter what program he using, it would cause the interference all the time. However, trying the balanced is not an expensive experiment and I would agree that a balanced connection is the way to go whenever you can. It may do the trick, ground loops are weird and hard to trouble shoot.

If there is a cable to be suspicious of it is the Firewire cable. Or perhaps the firwire connector on the FA or the computer.

Did the Lexicon interface have a standard IEC power cable? Does the FA have a wall wart power supply?

I'd like to hear the noise to know if it is indeed 60 Hz or something else entirely.

Get TRS cables and come back with your results. You need to have the correct cables. Otherwise, you could be running yourself in circles. # 1 rule in troubleshooting. Make sure you have the correct equipment to do the task at hand. As of right now, you do not have TRS cables. So i would stop everything and get some...
Cj

This is a common problem, particularly with buss-powered audio interfaces, both USB and firewire.

What is happening is essentially that the internal circuitry of the FA-101 draws its power from the Firewire bus. Not only is this power rail already noisy from the internal computer operations, which impose spikes on it, the audio interface, itself digital, will also impose further noise on the power rail.

Unfortunately this noise current has to return via the earth connection, and in so doing it introduces a voltage in that connection. This then appears as an audio signal.

There are a number of ways to mitigate this problem.

Firstly, use special balanced cables. You can make these yourself. The signal shield is not carried through and should be lifted at the interface end of the cable. This normally will resolve the problem

Secondly, if the audio interface has a metal case, connect a stout cable - at least 2mm cross-section internal conductor - between the audio interface case and a ground point on the computer, such as the back panel. This provides an alternative, lower-resistance path for the power supply noise current and will often greatly reduce the audio noise.

If the interface supports a non-buss powered mode (I don't think this is the case for the FA-101, unfortunately) then this is also a good solution. It eliminates the noise current in the firewire or USB cable.

UNDER NO CIRCUMSTANCES should mains-level grounds be lifted. Apart from being dangerous, you run the risk of frying sensitive preamps when cables are plugged in. Using ground-lifted signal cables is, however, perfectly safe.

This is really getting to me. This noise now only exists when I open a program that needs to use the fa-101 to make sound such as Win Media plyr, and sonar. It does not exist in the headphones and when nothing is open aaaahhhhhhhh!!!!!!!!