Try rebooting the computer. Before the Windows screen appears start pressing F8. This will allow you to go into safe mode. You need to choose the option to Restore to last known good configuration. Your computer should restart and allow you to finish your update.
If you hit this issue installing from Windows Update, please see this KB article: http://support.microsoft.com/kb/949358
Hold F8 while booting to go into safe mode, or last known good configuration. Then, preform the update from there, and that should fix your problem.
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