Originally posted by jatrax
You might take a look at the drivers for the card reader in the Vista machine and make sure the reader and driver will support the card. Some older card readers do not support modern cards even if the OS does.
Jatrax and others-- I think this may be the situation-- I checked my driver for the slot and it was 2006 with no available updates available. I dug up a sandisk micromate usb card adapter and plugged in the lexar 64gb sdxc card through that and all seems to be working correctly! And at full 64gb capacity too.
Time for a new computer-- not because of this only-- my dell inspiron 1720 is suffering severe onset dementia in many ways and this is just one additional malady to deal with.
thanks for the quick responses.