When I use my 5100c scanjet (HP) I get 2 error messages-
couldn't find the required dll (1)
HP. precision scan - Problem with calibration file - calibration utility  - re-run (2)
Have done this but error messages still there!
This question was answered on September 22, 1999. Much of the information contained herein may have changed since posting.When installing scanner in Windows, the following error occurs: "unable to open C:\Scanjet\Precisionscan\Hpprscan.reg."
Follow the steps below:
From the Windows desktop, select Start, Programs, Windows Explorer
In Windows Explorer, select the HP ScanJet directory, then the HP PrecisionScan subdirectory
Within the HP Precision Scan directory select (double-click) the file Hpprscan.reg
Restart the computer
SUMMARY: This error occurs because the Windows Registry cannot communicate with the scanner By selecting Hpprscan.reg (as detailed above), the registry is initialized manually and communication with the scanner is enabled
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Posted by Ken of Data Doctors on September 22, 1999