I went to Bigfish, as I was VERY curious why they would allow a virus ridden game to be distributed freely..
(I got the Mystery case files game as well, and it was not labeled as containing a trojan.
This is what I read..
"Some antivirus or personal firewall applications incorrectly identify our games as containing viruses and disrupt or block the software from running. Please be assured that the games coming from us are virus free. To avoid this issue, there are three things to try:
Option A:
If you update your version of your virus protection program you should find that this problem no longer occurs. You can update your virus protection program from the manufacturers web site and restart your computer. If you have removed the game from your computer, simply re-download it again from our web site and it should work fine.
Option B:
TEMPORARILY DISABLE YOUR PERSONAL FIREWALL until you have downloaded, installed, and activated your purchase.
How to disable your personal firewall on Windows XP:
1. Right click on My Network Places
2. Select Properties
3. Double click Local Network Connection or Modem
4. Click Advanced
5. Uncheck Internet Connection Firewall
Please Note: If you're evaluating the free trial version and you see a blank page or error message in the browser when you open or close the game, your personal firewall product is the most likely cause. You will need to temporarily disable your personal firewall to see the "play now/buy now" page.
***We strongly recommend that you re-enable your antivirus software after purchasing a game (or as soon as possible). We must also remind you that disabling your antivirus software is done at your own discretion, and Big Fish Games specifically disclaims any liability or claims for damage arising from your decision to disable this program.***
Option C:
IF YOUR ANTIVIRUS SOFTWARE DETECTS THE PRODUCT AS A VIRUS OR TROJAN (only some antivirus products exhibit this behavior) SET AN EXCLUSION FOR THE FOLDERS CONTAINING YOUR GAME.
To Mark the files or folders containing downloaded games as safe, refer to your antivirus/personal firewall product manual or help page for instructions on setting exclusions."
I haven't done this(my game is now in the virus vault of AVG but I thought some one might find this interesting..)