Windows X's Live recommends:
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The warning may seem superfluous, especially since it echoes a similar recommendation from Microsoft at the release of the beta 2 of IE8 last August. But we do still not accuse Microsoft of playing background transparency.

With the RC1 version of IE8 freshly made public, the "problem" remains the same as the previous test versions of the browser. Thus, if a user of Windows XP has completed the installation of SP3 after the IE8 Beta 1 or 2, the installation of over RC1 can become a free return.

A warning will properly alert the user attempted on the relative dangers of its action, but if he decides to ignore it after installing IE8 RC1, it may in the future to uninstall IE8 or SP3.

"Windows XP SP3 and IE8 RC1 will become permanent. You can always upgrade to higher versions of IE8 will be proposed, but when you can no longer remove them" said Jane Maliouta, program manager for the deployment of IE8.

To avoid the fragmentation that some users in horror, the workaround is fairly straightforward but tedious, consisting prior to uninstall Windows XP SP3, uninstall the beta of IE8, SP3 and then reinstall the RC1 of IE8 desired.

No problem for Windows Vista and Windows 7

With Windows Vista and its SP1, no problems of this kind, and most importantly, it is not necessary as before to manually uninstall IE8 beta before installing IE8 RC1. Everything is taken care of automatically and the user if necessary, every opportunity to make a clean uninstall from the control panel dedicated. As for Windows 7 beta, no worries because IE8 RC1 recall that it is not intended.