Thanks Neo, that fixed.
...but not completely. I use IE almost only for reading e-mails and when visiting some uploading/streaming sites (in all other occasions I use FF, P3HMIS). Though when reading the mail from the MSN link the window still open in that size. Guess I have to give up.
Btw, another question. Is it somehow possible to make the MSN link to e-mails open FF instead of IE?