Try formatting your SD card to FAT32 with:
http://www.easeus.com/download/epmf-download.html
After formatting your SD card under Android another option might be to use Paragon ExtFS for Windows, you should be able to see all your Android partitions under Windows then.
Essentially the problem is that the SD Card Association decided that SDXC would be required to use a file system called exFAT, which is covered by patents held by Microsoft and in consequence is a bit of a problem for Open Source Software like Linux/Android. NTFS is also a problem in that it is a proprietary system that belongs to Microsoft and 3rd party implementations have had to reverse engineer software and/or guess how it works to write software to handle it.
FAT32 is open, more or less, but is not as reliable as the other file systems mentioned above. For data interchange there’s nothing better that FATxx.
You might be able to use NTFS (Android sometimes supports it) but I can’t check at the moment.
Also always check your SD card with something like H2testw, there are lots of fakes around even from reputable dealers.
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