Those are 32-bit plugins so they probably won't work on 64-bit.
2010 comes with the correct plugins already though.
I know they are already there, but I didn't back it up before putting yours in, so I can't get them back. Also, before I replaced it, I selected all the neccesary check boxes in the dialogue box after importing it, and it said "An error has occured and 3ds max will now close. No scene changes were made prior to error" or something. And when I tried to download 3ds max 2011, it said I needed a disc with a certain volume, so basically I can't do anything. I get problem after problem, and it's really annoying.
EDIT: Nevermind, everything's goin' smoothly now