From the IE8 release note:
If Internet Explorer 8 Beta 2 does not appear in the Currently Installed
Updates list, run the following command at an elevated command prompt:
FORFILES /P %WINDIR%\servicing\Packages/M
Microsoft-Windows-InternetExplorer-8*.mum /c "cmd /c echo Uninstalling
package @fname && start /w pkgmgr /up:@fname /norestart"
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