Hangs how, where? Is this a job that didn't hang before the patch?
If you really want to do this (remove the patch), you'll need Windows XP Pro SrvcPk 2. In the "Add/Remove Programs" window, there is a checkbox in the middle (at the top) to show patches. If you check this, you'll see all the patches that have been applied to all the applications on your system.
You should be able to remove the 060301 patch.
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Regards,
Richard Ay - Consultant