I Can't play crossfire please help me

I cant play crossfire because always when i start a match there came a message (Disconnected from Server) or (Disconnected from Host Server).
Why came these messages?

Sry for my bad english :S


My System:
Microsoft Windows XP
Home Edition
Version 2002
Service Pack 3

AMD Sempron(tm)Processor
3000+
1.80GHz,512 MB RAM

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