Where did you get the skins from?
Are you sure you have the latest virus definitions?
When the message telling you that you have a trojan pops up, write down the name and go to Antivirus company's site (for example if you have Norton, go to Symantec): they should have removing tools available.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-