-matrix.dal.net- *** You are banned from matrix.de.eu.dal.net
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-matrix.dal.net- *** Reason: [exp/comp] Compromised host on this IP. See http://kline.dal.net/proxy/proxyinfo.php?dnsbl=tc.b&ip=219.95.209.202 for more information. (2009/10/24 17.30)
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-matrix.dal.net- *** Connection info: <unnamed>([-]unknown@219.95.209.202) [219.95.209.202]
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-matrix.dal.net- *** Ban contact: arcor-staff@dal.net
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-matrix.dal.net- *** When contacting DALnet, please include all of the information shown above
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K-banned: [exp/comp] Compromised host on this IP. See http://kline.dal.net/proxy/proxyinfo.php?dnsbl=tc.b&ip=219.95.209.202 for more infoClosing Link: 0.0.0.0 (K-banned: [exp/comp] Compromised host on this IP. See http://kline.dal.net/proxy/proxyinfo.php?dnsbl=tc.b&ip=219.95.209.202 for more information. (2009/10/24 17.30))
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why are this problem always occurs when i loggin to irc? please help me..this problem occurs in few days already...what should i do?

Follow the instructions and the links given in the message.

Aside from telling you that, there is nothing we can do.

You also might want to read this sticky

this problem will lasts longer or just temporily?

It means your IP has been blacklisted, if your IP is dynamic reset your internet connection (however the whole block may be blacklisted) If you have a static IP ask your provider to help clear it up. If you are using a proxy try connecting without the proxy.
Good luck