Uninstall the pre-release version of SP2, then reset your keyboard
preferences under the control panel/regional and language options/languages
tab/details/settings tab/installed services.
Pre-release versions are a) not supported and b) not for everyone.
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Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Associate Expert - WindowsXP Expert Zone
Windows help -
www.rickrogers.org