have you thought of editing msn messeger with a resource hacker. i did ad it worked fine i got rid of the advertisments at the bottom and also tabs here i took a screenie:
If you want to use this then copy your old msnmsgr.exe, usually found in the directory c:\program files\msn messenger, to a folder called backup or just rename it. Once you have done that download this file:
Msn Messenger without ads
Now move this to the folder c:\program files\msn messenger. Run msn messenger and enjoy your msn messenger without ads.