Well, if you can't get nandbincheck to work, I would say the chances of ohneschwanzenegger making a bad nand.bin is very low. Now you should be able to get nandbincheck to work, try opening a console as administrator. If you can get it to work, I would just try to restore it and see how it goes. You can't make things any worse, so there is nothing to worry about.
ohh thats great u def can fix it i got bricked before i can send u my nand just use it through bootmii and youll be back to normal it wont hurt ur wii at all
After a bit of jigging about etc i finally got it working. The reason nandbincheck wasnt working was becasue for whatever reason the key wasnt matching up with the nand. (Happens alot apparently) I found a program called BOOTMII -Keyfix which matched them up so i started again with a fresh nand backup and followed your instructions flawlessly.
I cannot thank you enough for your advice.