Installing the browser is absolutely no problem, with standalone packages tailored for every version of the supported operating systems. Uninstalling it however is a tad more tricky, but not by much. As far as XP SP2, XP SP3 and Windows Server 2003 are concerned, all you have to do is make your way via the Start Menu, Control Panel, Add or Remove Programs. In the programs list, simply select IE8 Beta 1 and hit remove. As it is the general case that IE8 Beta 1 will upgrade either IE6 or IE7, uninstalling it will simply leave you with the previous version of Internet Explorer.
"The computer will revert to one of the earlier versions of Internet Explorer depending on your scenario. [Either] Internet Explorer 6 + previously installed Internet Explorer 6 security updates or Internet Explorer 7 + previously installed Internet Explorer 7 security updates. In Windows Server 2003, you may be unable to cleanly uninstall Internet Explorer 8 Beta 1. When uninstalled, the Internet Explorer entry might be missing in the following locations: on the Start menu and when you click All Programs on the Start menu. However, the earlier version of Internet Explorer is still present on the system, and you can start it from the Quick Launch Bar or by running Iexplore.exe from the Run command," Microsoft revealed.
Microsoft, Internet Explorer 8, IE8, Uninstallation