Uninstalling Internet Explorer 7 Beta 3
To uninstall Internet Explorer 7 Beta 3 and return to Internet Explorer 6 on Windows XP or Windows Server 2003
Click “Start,” and then click “Control Panel.”
Click “Add or Remove Programs.”
Scroll down to "Windows Internet Explorer 7 Beta 3", select it, and then click "Change/Remove".
If you cannot find any Internet Explorer 7 entry in "Add or Remove Programs", run
%windir%\ie7beta3\spuninst\spuninst.exe.