help with a nasty Trojan (Trojan-Proxy.Win32.Horst.sv)?

Hello I've recently caught a really nasty virus called Trojan-Proxy.Win32.Horst.sv and I can not get rid of it. They are "96exinjs.19.exe" files and is in the C: Documents and Settings Administrator Settings directory local Temp. Each time you delete one of these emerging new ones. The only difference is that the number in front of their names is another. I would be very grateful if someone give me some information on how to remove this Trojan. Thanks!

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