I need help with this error, I´ve been trying to delete Msn Messenger from control panel add/remove programs  but it woun´t let me, and I´ve tried doing everything.

umm, i think i had this problem installin it on windows xp pro, i think you have to do a disk clean up

Click here for instuctions

From Mess.be



Thanks to Amy for this FAQ about a confusing error that commonly appears during the installation of MSN Messenger 6. The full error message reads:

    "You do not have sufficient privileges to complete this installation for all users of the machine. Log on as administrator and retry this installation."

    "Msn messenger setup has failed with error code: '1603'. Please go to MSN Messenger website to download software from there."

Not a very user-friendly error message if you ask me, but then does such thing exist? Anyway, I haven't verified the suggested solution, but here it goes:

1) Click Start > Run
2) Type msiexec /unreg and press enter and wait until it appears to have finished.
3) Go back to Start > Run
4) Type msiexec /regserver and press enter.
5) Try to install MSN Messenger 6 again. Good luck!

The instructions are for Messenger 6 but I'm sure it'll work the same for Messenger 7.

It says to delete the newer version first:

- uninstall newer MSNM
- reboot
- remove all folders in program files folder pointing towards MSN Messenger

After that try installing again.