This was posted earlier by an anonymous Fixya guest:
I HAVE FOUND A SOLUTION TO NOT BEING ABLE TO SCAN WITH ALL IN ONE CENTRE with VISTA
hi guys, i have had the same problem, i have a p4350 all in one printer and when i updated to Vista i couldnt get my install cd to work...i downloaded the install file from lexmark website...cjr4300eng.exe and all worked except OCR and FAX...i emialed lexmark and they couldnt help.....but i tricked my computer and now everything works just fine.....this what you have to do......
Step 1 - uninstall all previous lexmark software
Step 2 - download the cjr4300eng.exe file from
Step 3 - extract the file to c:\drivers\printer\4300 but do install the software, just cancel
Step 4 - once you've extracted, copy the OCR and FAX folders from the original INSTALL CD to the same directory c:\drivers\printer\4300 along with all files from the ROOT directory (autorun.inf, cdicon.ico, hidclass.sys etc) on the CD EXCEPT "setup.exe"
Step 5 - open setup.exe and wait for install, it should notify you twice of installation so be patient.....and WOLA you're done
Hope this helps guys....