well the easiest way i can think of is
getting the PC connected to a box (VCR??) which has scart in and RF out (stardard aerial)
and then have the RF to boosters splitters or whatever you call them
that connect to the TVs you want
and for controls
does these
TV link work with windows media remote controls???
but with this the image quailty would be very bad
but its the easiest way i can think of for me if i want to do it (as my home has similar setup for SAT)