Since XP isn't supported on the original software, you'll need to get have the additional drivers/software to get it to run. "Hard to Find" drivers of that type are certainly worth burning to a CD for later use. I'm sure you did that, right?
The EXACT error message might assist us in finding the problem.
The UMAX site below should help:
Hope this helps.
Hi. My Umax 1200s Scanner is not scanning. I get error opening source. The scanner has to be on prior to booting up. I've checked that. I have gone to control panel and tried to reinstall the scanner but it doesn't list my model... only the UMAX 610. My UMAX disc is not compatible with Windows XP. I think I was running Win 95 when I originally purchased it. I can't remember but I believe I got the drivers from Windows XP to get it to work or I may have gotten them from UMAX.
I have an AMD 1700 Athalon and am running Windows XP.
The Scanner is an older "97" UMAX 1200S SCSI device.
The last time I used it was 2 weeks ago