At one point in the past is it possible that you opened the "Full Motion Video V4.5.exe" file before it was unpacked & installed as a program w/ the "File Opens With" Dialog box? If so and the "Always open w/ this program" checkbox was checked then you need to run a check for all ".exe" file extensions in "Find Files & Folders", see if there are a lot of (similar Icon'ed) associated files ending in .exe (I have seen this problem before on machines I maintain @ a local school).
One more thing...Are the "other machines in your network neighborhood" powered up and connected to the network? May sound a little simple & crazy, but even though all users in a specific neighborhood were told to leave the units running (they didn't, all shut themdown on the same long weekend). I was working over that weekend and did not have access to the rest of the "hood", worked on that machine 8 lousy hours before I started calling in other users to turn on those blasted machines....Ohhhhhhhh, There youall are! I could have died! They were all sharing files within minutes.