Windows 7 has a service pack and some laptops need more than the card reader driver. The thing about Sony is you want to use their supplied OS. Otherwise you run into odd issues.
I have a Sony Vaio VPCEG32FX I recently reinstalled windows 7 and now my laptop will not read 16GB SD Cards, it does read the 8 GB SD Card. I installed an updated driver from the sony website but no luck! Does anybody know what the problem is??