Just tried to install Fish Tycoon for windows and my antivirus software said it was infected with an unknown virus. I have uninstalled it, but wondered if anyone else has had this problem?

We haven't heard any reports of this before. Anyone else?

What kind of virus software, may I ask?

F-secure anti-virus v 5.4

When does F-Secure notify you of the suspected virus? During the download, during a scan, or during the installation? Sometimes antivirus software gets a little aggressive about reporting viruses during the course of program installation, since files are "changed" during software installs.

I've scanned the downloaded file (en_fishtycoon_inst from Big Fish Games) with the latest Norton AntiVirus and found nothing amiss. Is it possible that you're seeing a false positive?

I have infected my computer with an unknown virus while downloading it. I don't think it is a virus. It could be some spyware.

Big Fish Games has an option to install a toolbar when you run their installer. This toolbar shows you new games they are adding, etc. They do this for all their games. It's pretty easy to install accidentally. My understanding it that it can be removed easily as well, although I haven't played around with it much.