in opening … really wanna' thank all of you for the input … the following works for my 64-bit laptop. my environment is toshiba-satellite-p55 … win-8.0 operating system … 64-bit architecture.
fantail suggested installing visioneer's 9420 driver … gafferx elaborated really well with the driver's selection … xweaponx for his thorough elucidation and methodology.
if you have previous non-functional installations of visioneer, you might uninstall those first. afterward, download both of the drivers … then unplug the scanner from your computer. reboot.
make sure the scanner is ready to "plug-n-play" by plugging the device into the wall-outlet. there should be little amber light on front-panel lit … if not, make sure you have "unlocked" the scanner underneath the bed … and that the i/o switch is switched on.
install 8100u.303110.EN.exe (run@admin / win-xp-sp3 comp). once 8100 has been installed, plug the scanner into your computer and turn it on. you will now notice "visioneer-8100-scanner" listed in the program-install interface. pull up device-manager, 8100 should appear in "other devices" … the "properties" window probably will state the driver has not been installed. reboot.
now install 9420.64.4071123.EN.msi on top of the 8100 install … you will now notice "one-touch-4.0" is listed in the program-install interface. pull up device-manager, and 9420 should appear in "imaging devices". as gafferx suggx … while in device-manager, update-driver by going to "browse my computer …" and then "let me pick …". reboot.
i've been using paint-shop-pro(7.0) as the interface with the 8100-scanner (instead of picasa). unfortunately, i've not had any luck using windows-paint nor windows-fax/scan as the interface. you might have better luck. within psp, import / twain / select-source (choose scanner) … import / twain / acquire.
you might find it necessary to go to devices/printers via control-panel … where you should see onetouch-8100 listed … i've allowed windows to reconfigure the connections by clicking "troubleshoot" … which seemed to help.
again … thanks for everyone's help … hopefully my interpretation, in turn, helps others out.
fantail suggested installing visioneer's 9420 driver … gafferx elaborated really well with the driver's selection … xweaponx for his thorough elucidation and methodology.
if you have previous non-functional installations of visioneer, you might uninstall those first. afterward, download both of the drivers … then unplug the scanner from your computer. reboot.
make sure the scanner is ready to "plug-n-play" by plugging the device into the wall-outlet. there should be little amber light on front-panel lit … if not, make sure you have "unlocked" the scanner underneath the bed … and that the i/o switch is switched on.
install 8100u.303110.EN.exe (run@admin / win-xp-sp3 comp). once 8100 has been installed, plug the scanner into your computer and turn it on. you will now notice "visioneer-8100-scanner" listed in the program-install interface. pull up device-manager, 8100 should appear in "other devices" … the "properties" window probably will state the driver has not been installed. reboot.
now install 9420.64.4071123.EN.msi on top of the 8100 install … you will now notice "one-touch-4.0" is listed in the program-install interface. pull up device-manager, and 9420 should appear in "imaging devices". as gafferx suggx … while in device-manager, update-driver by going to "browse my computer …" and then "let me pick …". reboot.
i've been using paint-shop-pro(7.0) as the interface with the 8100-scanner (instead of picasa). unfortunately, i've not had any luck using windows-paint nor windows-fax/scan as the interface. you might have better luck. within psp, import / twain / select-source (choose scanner) … import / twain / acquire.
you might find it necessary to go to devices/printers via control-panel … where you should see onetouch-8100 listed … i've allowed windows to reconfigure the connections by clicking "troubleshoot" … which seemed to help.
again … thanks for everyone's help … hopefully my interpretation, in turn, helps others out.

My Computer
- Computer type
- Laptop
- Computer Manufacturer/Model Number
- satellite p55-a5312
- OS
- win-8.0 (64)
- CPU
- intel core i5 dual-core 4200u @ 1.60ghz
- Motherboard
- toshiba vg10st (socket 0)
- Memory
- 6.00gb dual-channel ddr3 @ 798mhz
- Graphics Card(s)
- intel hd graphics family (toshiba)
- Hard Drives
- 698gb hitachi hgst hts541075a9e680 (sata)
- Antivirus
- avg-free … with some assistance from malwarebytes-free
- Browser
- firefox 'n chrome 'n explorer