I think the encryption used for javascript is turning up false positives in a few virus scanners caused by the /modules/pligg_chat/pligg_dedicated_server.html file. If you're uncomfortable with the warning just remove that module, its only used to connect you to the Pligg chat room where the developers help you out.
The file is not a virus and is no threat to your computer, it's used to embed a javscript chat room for a Pligg module.
Thank you yankidank for your fast reply. After the first shock because of the alert warning I now calm down. I am now a little bit ashamed because of the threat title. If you want, please change. I will try this new version now.