IE6 in Windows7

How can I test my websites in IE6 on Windows 7 RC? I originally used a program called IETester on XP, which bundles together IE6, IE7, and IE8. This program is better than the standalone IE6 because it handles cookies and stuff better. Now that I have Windows 7, opening an IE6 tab crashes the program. Wasn’t there some XP compatability mode I could switch to on Windows 7?