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When Sony do not provide a Win7 Memory Stick driver, this means that the originally provided Vista driver should work.
I would try installing the 3 flash memory drivers originally installed. You can download the Ricoh Memory Stick driver and the 2 SD card drivers from here: -
http://support.vaio.sony.eu/computing/vaio/downloads/preinstalled/index.aspx?l=en_GB&m=VGN-Z21ZN_X
When Sony do not provide a Win7 Memory Stick driver, this means that the originally provided Vista driver should work.
I would try installing the 3 flash memory drivers originally installed. You can download the Ricoh Memory Stick driver and the 2 SD card drivers from here: -
http://support.vaio.sony.eu/computing/vaio/downloads/preinstalled/index.aspx?l=en_GB&m=VGN-Z21ZN_X
Thanks for the advice, are the drivers for the base system device, the error message for the SD host adapter has now gone?