If you're dual-booting, then you might want to:
-Boot from the old kernel that supports vfat.
-Use make xconfig (presuming you're running x).
-Save the configuration files to the Windows Partition.
I've got a 'folder' on my Win desktop that contains all files I need to keep for Linux - just incase I cock up bigtime!
Since the kernel config files are not too big, if you make any changes you might want to keep a record of them.