I have a system running Quickbooks POS (7) with a Epson TI88III thermal printer and a Handheld Products bar code scanner. The printer had stopped working so I uninstalled the driver and related software and re-installed. I could not find a driver on epson's website and resorted to driverguide to get one.
After installing the driver, the printer was working again. However as soon as I plugged the scanner back into the system I got a 'problem with usb device' message. After re-installing the scanner's drivers (once again from driverguide - seems Handheld Products is out of business), and uninstalling/re-installing the printer again a test page printed correctly.
I then opened Quickbooks to test things, opened the cash drawer (processed by printer), and printed a receipt. The printer in Quickbooks had changed to another device, so I changed it back. After doing this Windows said it found new hardware (it shouldn't have), then that a problem occured during installation of said hardware. Device manager showed the Epson usb port (not the printer driver itself) with an exclamation point - details said it could not start. I re-installed this driver and the printer is still not working.
Any thoughts on what might be going on? I didn't get a chance to re-install the printer again. (note: the Epson usb port driver is installed with the printer installer package).