Should I be worried when my anti-virus software reports a virus/trojan/packer in a file downloaded from scene.org?
Maybe, but probably not. Many intros and demos use a packer to decrease their file size. Unfortunately some malware attempts to disguise itself by using similar packers. Good anti-virus software will be able to unpack files to test whether the packed file is a virus or not, but some less sophisticated anti-virus scanners can’t do this and will always report a virus when they detect such a packer. In most cases you can simply ignore these false positives. However, it’s possible that a virus has slipped through our radar, so you should always be careful when your anti-virus software complains about a file. You can scan the file with some alternative anti-virus programs to see if they also report a virus. You should also send a copy of the file to the company that created the anti-virus software so that they can analyze the file. The more complaints they get about false positives, the sooner they’ll fix their software to correctly identify these files.