GIven your user is the only report of this problem would indicate even more strongly it is his/her problem, not a general problem.
I can't find FCE 4.6.2 either.
I have no idea where I came up with that version number but I have corrected my original post. Yes, iMovie 8 is part of iLife '09 and it is only available as a paid upgrade. That is one reason the cost per app in the iLife suite is relatively inexpensive for the capabilities offered.
Be sure and check the Quicktime plug-in versions, those can bite.
With that additional information, ask your user to try logging onto an different account on the Mac and see if the problem follows to the other account or not. If it does
not then it is isolated to something in the regular logon account and a different troubleshooting path that needs to be taken.