If you don't know if it's installed or not I doubt you have it installed..
If you have not installed a codec pack that include it in it's installer you don't have it installed (thake a look at "Add/Remove programs" item in Windows Control Panel)
Anyway it's a low risk threat in my opinion since the "attacker" must know that your are running a player with that particular codec and you need to have BSplayer to listen to inbound connections and/or 3ivX codec to do so too, and the streams that need 3ivX to decode them are really few nowadays. Yes, there could be the remote possibility that full time scanners are used to scan all your ports for weakness, but if you have a firewall installed (even the worst one such as Windows Firewall one) these attemps will be unsuccessful.
Plus remember one thing: If a hacker wants to take posses of your computer he will do!
Personal firewalls are intended to protect users by them self in first place, and from the majority of automated hacking methods. But to professional hackers those make only the work harder, not impossible. Exactly the same as house alarms. They can keep casual thieve away from your home, but Lupin knows how to break them.
"the weak link in the chain is almost always the man himself"
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