HP Precision Scan 3400c LTX scanner software

After my power module for this scanner failed, I got a new module, and the scanner powered up. I can use the scanner using XP's Scanner and Camera Wizard, but the HP software for the scanner, designated LTX, will not work - a pop up message appears stating that scanner could not be initialized - scanner not found. I am sure that the obvious solution would be for me to reinstall the software using the CD that came with the scanner, but I am reluctant to do this as I apparently have the driver installed ok - the scanner is recognized in Device Manager and under Scanners and Cameras in Control Panel - and, as stated, I can use it with the XP Wizard. Any suggestions appreciated.

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows XP Home Edition, Service Pack 3, 32 bit
Processor: Intel(R) Celeron(R) M processor 1.70GHz, x86 Family 6 Model 13 Stepping 8
Processor Count: 1
RAM: 958 Mb
Graphics Card: ATI RADEON XPRESS 200M Series, 64 Mb
Hard Drives: C: Total - 76067 MB, Free - 46388 MB;
Motherboard: ATI, SB450
Antivirus: avast! Antivirus, Updated: Yes, On-Demand Scanner: Enabled