In windows run command line and type diskpart:
1) List your disks "list disk".
2) select the flash disk, "select disk #". Where # is the drive where the card is, be careful to select the correct drive number.
2) "clean" (wipes current partitions) *be sure it's the correct drive!*
3) "create partition primary align=4096"
4) "active" (sets the partition active/boot)
Now your card should be recognized by windows and will ask if you want to format.
Click yes and select fat32 with 64 kilobytes for partition size.