Outcast installed fine and started with the opening movie and went to the launcher, but the first time I tried to run the game, Norton Internet Security (v.17.6.032) popped up a window that said "...\Program Files\GOG.com\Outcast\oc3.exe was acting suspciously and has been removed." Norton now says oc3.exe is quarantined. It also flagged the start.exe file in the same directory. I'm on Windows 7 Home 64-bit. Any suggestions?

Hi,
You can set those files or the entire Outcast folder as an exclusion to keep Norton from deleting or moving files to quarantine.
As for those files being flagged as suspicious, false positive is the most likely, but you can grab something like MalwareBytes and run a scan just to make sure.

Hi, Madjack, I don't know ir you resolved this issue or not (seeing that you posted two months ago), but Norton Internet Security, as well as Norton 360, have a "feature" called SONAR. I would think that is the most likely cause of your problem.
This "feature" checks every executable, and sees how many other users in the "Norton Community" use that executable. If too few users use it, it removes it as a safety precaution. It considers too few users to be "suspicious"
It's funny, when I was working on a small online RPG with a small team online, it tried to delete the game, saying (accurately). "doz_client.exe was acting suspiciously and has been removed. Reason: Too few users use this". Talk about a blow to self-esteem. =)
SONAR gets in the way of alot of my programs, since I'm a computer programmer. Every time I recompile, SONAR treats it as a new program, and since no-one has ever seen it before, deletes the program I just compiled!
Anyway, you can disable SONAR, which I recommend, since disabling it doesn't interfere with the rest of what Norton does, and SONAR is a pretty poor/bothersome feature for most people.
I don't know how to disable SONAR for Norton Internet Security, but for Norton 360, you open up the main Norton control panel, and (hidden toward the top) select "Settings", select "Antivirus", and the last four setting options are SONAR related. Tweak to your delight.
You can also tell SONAR to ignore those two executables... but the likelyhood it'd remove other old games noone plays is high. To tell it to remove just those executables, when the pop-up message in the corner of Windows says, "This program has been acting suspiciously..." click on the window, and a screen with details will pop up, and you can select something like, "Restore file" (to undelete it), and then "Trust file now", to make sure it doesn't delete that one sepcific file in the future.
Good day sir, I hope this was of help (either to you, or your posterity).
[Edit:] Odd, didn't see Namur's reply when I posted... only the unanswered original post.