Firebird radio and power windows

If you check the fuse boxes, do they share the same circuit? When the problem occurs what was happening?... Was radio very loud, were you operating windows, were windows struggling to move, etc.?

I agree with checking the radio fuses? The power windows have a circuit breaker. One of fuses for the radio and power window circuit breaker, gets voltage from ignition switch, on position. You may have to check feed to and from the ignition switch?