I bought this game on cdrom when it first came out many years ago. I knew something wasn't right with the in-game videos, so I did some research. If you want to restore the original videos, you can get them here and replace them: https://www.moddb.com/mods/aliens-versus-predator-classic-redux/downloads/original-ingame-fmvs

The new videos that are included in the GOG version are TERRIBLE. These original ones that I remember, are far better.

Use virustotal if you're concerned about viruses.