http://tredosoft.com/Multiple_IE
IE 3,4,5,6,7 at the same time. Your current IE still be the same.
http://browsers.evolt.org/?ie/32bit
32-bit IE archiv
But dont use any Microsoft IE atm,use firefox or whatever, because of the zero-day-exploit.
Even IE 8 beta has the zero-day-exploit.
Use them on your own risk.