In response to reson8tor's question, when I ran the setup.exe file from the CD download it installed the ScanSnap Manager program, etc., at C:\Program Files (x86)\PFU\ScanSnap. You will find several subfolders here, including a
Driver folder.
Once I had the software installed I followed these steps:
(See Note below)
Plug the scanner into the computer (USB) and turn it on (open the top).
Go into “Devices and Printers” in Windows 7 and locate the "unspecified divice" icon that represents the scanner.
Right click on the icon and select Properties-Hardware-Properties-Change Settings-
Driver Tab and select "Update
Driver"
I selected "Browse My Computer" to manually browse to the Driver folder at the location described above, and I tried to manually load the driver, but it failed to load.
I then selected "Search automatically for updated driver software" and it found the driver - a red warning box about installing unsigned
drivers appeared, but I clicked to install it anyway.
The driver installed for my fi 5110EOX2 and it appeared in the Divices and Printers list. Success! My scanner now works great.
Note: After installing the CD software I also ran the driver repair tool (suggested by some folks who had done this). It's in C:\Program Files (x86)\PFU\ScanSnap\Driver\SsDrvRepair folder: a tool called SsDrvRepair-x64.exe It returned an error message, so I'm not sure if it did anything.