1) Perhaps the drive is not set to primary and/or active. Check it in windows.
2) If not that, try a different loader. There is a link for CFG in my signature.
3) You can also try to set up your drive in the fat32 format instead of WBFS. Link also in signature.
4) I know this is almost 2 days after you posted it, i was trolling for unreplied threads.