There is a bug in Internet Explorer version 8 beta 2 that affects Windows XP SP3 users. The bug occurs when the user make the following procedure:
1. Install IE8 Beta 1
2. Install Windows XP SP3
3. Install IE8 Beta 2
When a user follow these instructions, he or she cannot uninstall either Windows XP SP3 or IE8 at a later time according to the article at TG Daily.
Jane Maliouta of Microsoft said, “If you chose to continue, Windows XP SP3 and IE8 Beta2 will become permanent.”
“You will still be able to upgrade to later IE8 builds as they become available, but you won’t be able to uninstall them,” she added.
Source: TG Daily