Error 800401f3
When you try to start Windows Live Messenger you will get the following error:
Signing in to Windows Live Messenger Beta failed because the service is temporarily unavailable. Please try again later.
Error code: 800401f3
Error 800401f3 solutions
Try these solutions for error 800401f3

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#1 Unregistered DLLs
You can register them by going to start run and past the following lines one by one. After every line press enter (see below).
Or download this file. This will do the DLL registering for you.
regsvr32 Dssenh.dll /s
regsvr32 Gpkcsp.dll /s
regsvr32 Slbcsp.dll /s
regsvr32 Sccbase.dll /s
regsvr32 Softpub.dll /s
regsvr32 Wintrust.dll /s
regsvr32 Initpki.dll /s
regsvr32 Rsaenh.dll /s
regsvr32 Mssip32.dll /s
regsvr32 Cryptdlg.dll /s
regsvr32 Msxml3.dll /s