Alt Gr problems

[Barman Brakjoller]

I have a problem executing key combinations like C-c C-\ because to
reach the backslash on my keyboard with Swedish keyboard layout I have
to use Alt Gr (the \ is to the right of the zero-button on the top
row) So in my case C-\ would be C-<AltGr>-\. But it does not
work.

To reach the @ character I also have to press Alt Gr, but things like
M-@ still work (where I hold down the Alt, Alt Gr and 2 keys at the
same time).

So it works together with M (alt) but not with C (Ctrl).

Why is this so and can I fix it?

I'm using Emacs 21.2.1 on Windows 2000.