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Old 04-08-2011, 05:01 AM   #7
itimpi
Wizard
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Posts: 4,553
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Join Date: Nov 2008
Device: Sony PRS-950, iphone/ipad (Marvin/iBooks/QuickReader)
This is normally due to a previous Setup (not necessarily one relating to Calibre) not completing successfully. The Windows install sub-system is designed to roll-back setups of new apps in such a situation. Until this is cleared you may find other programs will not install either. You would have to do some Googling to work out how to clear this condition.
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