Unable to uninstall the Messenger?

Hi. First: Sorry for my very bad english.

I have a system with a, form a company modified Windows Messenger 5.1.
I have removed the Messenger from the system. I have changed the
configuration in the sysco.inf file to make the messenger visible in
the Add/Remove software list.

I also run the RunDLL32 advpack.dll,LaunchINFSection
%windir%\INF\msmsgs.inf,BLC.Remove ti remove this.

After all I get the Message that the Messenger can't installed because
a older version is installed and need to be removed.
I also uninstalled via Add/Remove Components the Messenger and the
Messenger Service. Rebooted the system (after every step I done a
reboot) and installed again. Messenger 4.6 is on the system. But I need
version 5.0 or 5.1.

Also the try msiexec /x {C3A6819F-62D3-4750-AF1C-28206DDF2C2E} (no key
with messenger in it). Have somebody a idea?

Thanks a lot Maik

.

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