Ready boost issue!

hello again,after some nasty Bsod and a clean reinstall of windows to resolve that problem i've noticed that somethimes after startup the computer won't display correctly the physical and virtual dvd drives...and the sistem is too slow.i tryed in several times to restart it to see if the problem will disappear but the restart procces was taking ages to complete...till i've diconected the 4Gb Sdhc card wich was dedicated to readyboost.i tryed restarting the computer without the SDhc card in it..went fine...everthing was ok till i inserted back the card then suddenly the computer slows dramaticly stops responding and the problem mentioned above reappears!

My question :is it really a readyboost issue or some tech fault from my computer?and what can i do to fix i'm usig the computer without the SDhc card and the readyboost function.

my pc config is: toshiba satellite a 300 intel core2duo centrino 1,83 Ghz 4Gb ram
and the driver for the card reader is from O2 and it is the latest one!

thank you.

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