error with readyboost

hi all, hoping i can find some help to my problem, it's annoying to say the least.

all psyched by the promises of readyboost, i went out and bought me a kingston elite pro 2gb SD flash card, since my laptop has a flash card reader and i didn't want a thumbdrive sticking out. it worked fine for a few days.

then one day i wanted to put in another card into the same drive. when i wanted to safely eject, it wouldn't let me, said something was still accessing it. i then put the machine to sleep, took out the card and popped my other one in. later, when i put back the SD card, things started going to hell. when i try to open it, it'd say "Please insert disk into drive". plus the icon changed from being an sd card to a regular disk drive. it wouldn't read the drive at all.

i thought i'd bricked the card, but then when i popped it into my friend's machine (non-vista) just for the heck of it, i realised that it was still working. i went back to my own, switched off readyboost, and the card worked fine.

i can only come to the conclusion that readyboost is malfunctioning somehow. everytime i switch on readyboost it would fail to recognise that card, and only that card, all my other flash media would work fine.

i don't know how to fix this problem. kingston doesn't release any drivers, i can't update my drivers because vista insists that they're the most recent and that there's nothing wrong with them. personally i don't even think it's a driver problem anymore, it's just readyboost.

is there anyway i can fix this? 'cause i really want to use readyboost, and it's just tragic that it refuses to read my card. any help is greatly appreciated!

cheers