Open Control Panel.
Click “Add or Remove Programs.”
Check “Show Updates” at the top of the dialog box.
Scroll down the list to “Windows XP – Software Updates,” select “Internet Explorer 7 Beta 2Preview,” and then click "Change/Remove."
If "Internet Explorer 7 Beta 2 Preview" does not exist, then:-
Start>run >type in:%windir%\$NtUninstallie7bet2p$\spuninst\spuninst.exe.
You need to have "view hidden folders" enabled. %windir% is your Windows installation directory, which is normally 'C:\Windows' on most systems.