You're typing this in a cell?
First, what do you see in the formulabar after you've typed your entry?
If you really see multiple Y's:
I'd check the keyboard to make sure it's not sticking.
I'd check tools|autocorrect options|autocorrect tab
to make sure that the Y isn't being replaced with YYYY.
I'd check tools|options|edit tab|uncheck Enable autocomplete for cell values
(maybe excel is autocompleting the y's based on an entry in a close cell in that
column)
If you only see a single Y in the formula bar:
I'd check the format of the cell
Format|cells|Alignment tab|horizontal
Is Fill chosen? If yes, try General.
