Thanks for the quick reply!
Symlink looks fine to me:
lrwxrwxrwx 1 root root 21 2005-06-02 13:01 /lib/modules/2.4.29/build -> /usr/src/linux-2.4.29
The make dep runned fine as well, but the same error keeps coming up..
(cannot load nvidia.o)
[EDIT] Searched a lot around, and the best thing I can do seems to recompile my kernel, cause NVIDIA seems to have a problem with pre-copiled kernels. So that's my objective before the weekend starts..