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You may have incorrect or conflicting reader drivers installed. Windows has a penchant for creating situations where numerious drivers will fight for control of a particular device. The drivers lock in a deadly embrace and the device cannot be used. This happened on my Sony after a software update on the Reader Library. Try removing ALL of the Sony reader drivers via the Control Panel>System>Hardware>Device Manager>Universal Serial Bus Controllers.
Reboot you PC and re-install the Sony driver.
I had several problems using the Sony Library and switched to Calibre to manage my Sony - no more problems with it.
Good Luck.
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