Well ME is the next op system along the line from W98, so it's not surprising that the drivers may be similar.
As you're using a SCSI interface, you should see the SCSI BIOS message(s) on screen after POST and prior to Windows 98 starting up. This should show the type of SCSI adaptor you're using, and also the scanner's SCSI ID together with a brief description of the recognised device.
In W98, go into Control Panel and under the System icon select Device Manager tab, and check that your relevant SCSI adaptor is installed correctly under "SCSI Controllers".
You mentioned earlier that ".. since I've reinstalled it...", so have you completely reinstalled W98? Or what is the story behind this? (This might give us further clues as to what is going wrong).
Does the scanner programme you use recognise the scanner, or does it just say it's "not there"?
ROGER - GØAOZ.