I have a big bug on emacs. I can't resolve it.

When I compile a "*.el" (not all of them) I get this message :

Compiling file c:/Program Files/emacs/bin/atteindre.el at Tue Oct 07
14:37:27 2003
  !! Wrong number of arguments ((#[nil "\300c\207" ["$\\infty "] 1 nil nil]
1))

Thus all the lisp functions that are in this file are compiled with good
result and this file was compiled with success before monday 07/10/03.

More, since the same day:
I can't open tex file with auctex with the following message:
When I open an "*.tex" I get:

File mode specification error: (wrong-number-of-arguments #[nil "\300c\207" ["-\\infty "] 1 nil nil] 1)


The word "infty" in the error's message appears because this bug becomes while I used a macro with "infty" as input.
Thanks