Try updating your Windows Messenger.
Latest version is available here
Windows Messenger 5.1
http://www.microsoft.com/downloads/details.aspx?FamilyID=a8d9eb73-5f8c...9a-940f
--
Gary Tsang
Microsoft MVP - Windows XP Shell/User
http://www.microsoft.com/mvp
"Jane" <Jane DeleteThis @discussions.microsoft.com> wrote in message
news:DADAFDCE-B0C8-4539-9841-5710E50A6B58@microsoft.com...
> Windows messenger says" Signing into .Net Messenger Service failed because
> the service is not compatible with this version of the program". I have
> all
> the windows updates. I can only play games with my sister through the
> windows version as the msn version doesn't have the option. (Just got my
> computer back from a motherboard breakdown)
> Anyone have any ideas?