Hi Maciej, Several open source projects suffered from false positives. Usually you sent the file to the company having written your Virus detection application for review. It may be a Virus. However it's very unlikely. If you're in doubt you should compile from source and also check the source which was used to compile ghc .. etc. I want to say if you really want to be secure the amount of work is infinity. So I'd sent the file to AntiVir. Then I would go one ignoring the warning (If it *is* a Virus don't make me responsible for any damage - you never know.) I just tell you what I would do. Maybe delete the file and redownload it to make sure that it wasn't modified while traveling through the net? You can also paste the md5sum of those executables. Maybe someone else can verify them easily. Good luck Marc Weber