Hi,
If your VLOOKUP is returning the wrong information, you've probably omitted
the 4th argument. If you don't put in the 4th argument as ,FALSE then if
VLOOKUP doesn't find what you've asked for, it just goes for the closest
match.
If you do put in the ,FALSE then if VLOOKUP can't find what you've asked
for, it will return an error, which you can use as described in the other
replies.
Regards - Dave.