everyone searching the web for the installation problem 1603 in Install_Messenger.exe for Windows Live Messenger 8.0 or above should be very annoying to the various Google Results coming from this kind of 'install MSN error 1603', as all of them are useless..
I have this problem for a while and finally I have got a 'brutal force' solution to that..
1. find a clean computer to install MSN 8.0 or above using Install_Messenger.exe
2. In your target machine, install MSN Messenger 7.0 which is error free for installation
3. rename the directory name in your target machine C:\Program Files\MSN Messenger as different name (somewhat C:\Program Files\MSN Messenger.bak .. )
2. copy out C:\Program Files\MSN Messenger\ and put to your target machine
3. copy C:\Windows\System32\sirenacm.dll and put to your target machine
4. edit the MSN messenger 7.0 icon as you like in C:\Program Files\MSN Messenger\msnmsgs.exe ..
Then your installation will be successful...

Thousands of materials in web are talking about this topic, but I found none of them works..
So I just trying that all by myself..
just copy and paste the following html code into your web page and test, then you can get a fancy result..
(PS. Please don't ask me why javascript counterpart cannot hide the print dialog box, since I also don't know.. Orz)
* I guess maybe that's M$ strategy to force you to write stuff on VBScript instead of Javascript..