Cannot access your scanner – Error Message

Hi all
I used a HP-5P scanner before with Win95.
Because of the errors in constant 95 systems, I upgraded to 98SE. But after installing paper port and 5P, the scanner will not start.
However Control panel confirms scanner icon but when it opened, the box displays that the scanner was not found. SCSI is standard.
When I was trying to scan test from HP software, I found an error message, "sorry cannot access your scanner, and your scanner is currently being accessed by another application. Please wait for the other application to close or close it".
Configuration is, Pentium 133, 32MB Ram and 2.1 gig of hard drive.
Only Norton antivirus #4 is installed among all others software but it was disabled in HP installation.
Please help me.
Thanks.
