not understanding what your asking....do you want to uninstall IE7 and put IE6 back? if you do its simple, just go to add/remove programs and find IE7 and hit remove, follow the on screen instructions and it will reinstall IE6 for you!
@dienkhung - sorry bud, i dont think so but yo could install the files in your my docs, and just launch it from there. then only you can access it 300th post W00T!!!