This pretty simplistic script works with Vista and XP.
REG DELETE "HKLM\SOFTWARE\Geek Squad" /f
IF EXIST "%SYSTEMDRIVE%\ProgramData\Geek Squad\" (RMDIR /S /Q "%SYSTEMDRIVE%\ProgramData\Geek Squad\")
IF EXIST "%SYSTEMDRIVE%\Documents and Settings\All Users\Application Data\Geek Squad\" (RMDIR /S /Q "%SYSTEMDRIVE%\Documents and Settings\All Users\Application Data\Geek Squad\")
It clears the MRI registry key as well as the log files.