Mother's Day, plus weekend, so keeping this short
In case you can't find it...
If XBMC was uninstalled, open ES File Explorer or HD File Manager and head to the root of your device
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In ES File Explorer, there is a shortcut in the LOCAL menu on the left, click to expand it.
Click into the System folder
Click in the PreInstall folder if there is one.
Scan down the list for XBMC related APK files
Click on it
If Wizard was uninstalled accidentally, wipe XBMC's data and it should reappear. See
http://droidboxforums.com/threads/resetting-xbmc-to-a-just-installed-state.27/ for details.