did you ever down grade your wii?
what game did you put in your wii to let it try to update?
the only way i can think of you getting in this situation is if you downgraded that wii in the past and left in the stub IOSes. then you put in this game and it updated the system menu and now that system menu is trying to use the nonfunctional IOS. in this case, a nand programmer sounds like you only hope.
if you didnt ever downgrade that wii, then your wii sounds old enough that you will always be able to put bootmii@ boot2. if this is the case, then no matter how you screw up your system menu and IOSes, an infectious should be able to save you.