Look at my profile and shoot me a return address. I'll send an example scan from my 4x6 HP 1000 scanner and you can send one of yours. Then we'll get back together here.
No guarantees, but I don't see it.
I have a Dell computer which has served me well. Last yr I got a HP Scanjet5530. All the pictures I scanned look like they have been shot in a dust storm. (even at different resolutions-the higher, the "dust" looks like a starry night! also, the glass is clean) I have spent hours talking to HP, they sent 4 different scanner beds (all reconditioned and one didn't even work, and then they upgraded me to a new Scanjet5590. Same results. Someone in my office has a sc5530 and also uses a Dell...same results. Any suggestions? India HP hasn't a clue, either does Dell.