I invited my SIL to Live Messenger. She got it downloaded and installed
successfully. However when she tries to log in she gets the following error
message:

Signing in to Messenger 8.0 BETA failed because the service is temporaily
unavailable. Please try again later 8004883

I am signed into with no problem and when checking the service status it
says all it good.

She has XP home SP2 all updates installed. She can successfully use windows
messenger or MSN 7.5.

She does run McAfee Firewall and virus scan, but the firewall is set to
open. A side note I am running those with no problems.