I copied this from another thread. I just did a search for installer. This worked for me
"First, open "Computer", and then right-click your reader's drive letter. Left-click "properties". You're presented with a series of tabs. Click the "Hardware" tab. Choose "Sony PRS-XXX Launcher USB Device", then click the "Properties" button. This opens a new window, with a new series of tabs. Click the "Driver" tab, and finally click the "Disable" button. Finally, you will be required to reboot your computer. This disables only the Launcher partition driver, and does not interfere with normal USB operation of the device"
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