First of all, we need to know that the Windows 7 system is IE8 with its own IE components, so IE7 and IE6 cannot be installed.
The problem that the IE user encounters above, from IE8 Beginning is this, this kind of phenomenon is the design dictates. Since IE8, its session mechanism is different from previous versions of IE, all newly opened windows under IE8, their sessions (cookies, etc.) are shared, so the user information that is logged in will overwrite the user information previously logged in.
If you want to open the QQ space of two different accounts at the same time, you can click on the ALT key on the keyboard to bring up the menu bar and click "File"-"new Session" in the IE9 Beta page.
So in the new open page login QQ space, will not overwrite the previous open page information.
This approach also applies to IE8 browsers, but you can also solve the problem by IE8 privacy browsing.