Kathleen,
You made the first change seemingly witout any problem but thereafter things appear to deteriorate each time you attempt diagnosis or repair - it may be time to call in an electrician.
Your statement, "all wires remain live even when light is switched off" is both correct and incorrect.
Some wires should remain live all the time - some wires should be live only when the switch is set to on and other wires should never be live.
Reach for Yellow Pages.
Good luck...
Peccavi
October 2009