I think you know the issue so I won't tell you what you know.
I found one last XP machine is seeing less and less of those over 2GB cards and adapters. Since XP is not being fixed any longer it's not a peculiar problem. Just a problem you'll see more and more.
If I was unclear, I meant to be as folk that run XP have heard it all.
First of all, this is on an old Compaq Win XP SP3 laptop.
Starting a few days ago, all 3 USB ports are not recognizing any of the 3 USB adaptors for SD cards.
However: a) the SD cards are instantly recognized on my SD card slot, b) the USB ports recognize pretty much everything else, including external hard drives, mouse adaptor etc.
So this is more of an inconvenience than anything else.
I went to Device Manager and noticed, under USB controllers, "Unknown device" Properties: "no drivers installed for this device".
This is a very peculiar problem.
Thanks for any suggestions!