Possible Duplicate:
Why is uninstalling programs on Windows so slow?
What do the uninstallers do throughout the uninstalling process?
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closed as exact duplicate by techie007, Hello71, Simon Sheehan, Gareth, Nifle Nov 27 '11 at 21:51
This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.
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They delete registry entries, etc. Besides, MSI also saves uninsstall data in case the uninstall fails or is cancelled. | |||
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