Why am i getting this?

"Could not establish an encrypted connection because certificate presented by login.live.com has an invalid signature."

I'm getting that error popup anytime i try to log into my Hotmail... does it mean MSN's server is down or something?

by reading that error message, i conclude that Microsoft's SSL certificates are broken and retarted.

"Could not establish an encrypted connection because certificate presented by login.live.com has an invalid signature."

I'm getting that error popup anytime i try to log into my Hotmail... does it mean MSN's server is down or something?

Maybe. Does your Event Viewer show anything?

Well, i installed Windows Live Messenger and that seems to have solved the problem.

Your question krit86lr - yes it did.