I have had this problem before on different computers with the HP4100C model scanner and have never been able to solve the problem, even with the help/suggestions of HP.
Now I have the problem again and would like to know if (finally) there is a solution:
A computer was formatted and Windows 98 (1st version) was installed (Portuguese version). The installation went on 100% ok, the machine has no IRQ conflicts and is working fine. I then installed the HP4100C software with the original CD the comes with the scanner (without the scanner connected) and the installation went on fine as well. The problem is that when I plug in the USB cable, Windows tells me that it **has** found an HP4100C scanner but **can not** find the drivers for it, asking to insert a disk. I then insert the original CD again and tell him to search in D: (and under directories like D:\PORTUGUESE\DRIVERS, etc.) but it tells me that there are no drivers there for that scanner. I've uninstalled the drivers and installed them 3 or 4 times, but the problem is always the same, so in the end it installs the scanner as an "Unknown Device...". The USB ports are working fine because the scanner **is detected**. Just in case, I've also removed and reinstalled the USB devices (USB Root, etc), but the result is still the same. A stange thing is that the scanner was previously working on this computer but it had Windows 98 preinstalled from factory. Some months ago (the last time I had this problem) I really had to give up and I sort of came to the conclusion that it was a "HP software bug" on this model. I completely stopped buying the HP4100C model but I still have to deal with the existing ones...!!!
Any solution or updated drivers (since + - 4 months ago) that can solve the problem?