When I download movie files I can't open them. When movies are in MP3 format I don't have a problem except I can't view it until the download is complete. InterVideo Files work fine.
What do I do about the movie files?

You could try VLC player, it has codecs installed & can play most files
http://www.videolan.org/vlc/

I was considering purchasing the Pro version. Honestly is there a difference?

Pro won't make any difference at all to what video formats you can view!! That depends on what player you're using & which codecs you have installed. (mp3 is an audio format... not video)

Pro lets you connect to 2 extra uptrapeers, so the potential for better search results is there. You'll also be able to download from a couple of extra hosts - 10 compared to basic's 8 (14 if you have a T3 connection). If you have a slowish connection then Pro's not going to make much of a difference to LW's performance.

I think it's a good idea to get to know the basic version first. Iron out any problems using that & then, if you decide to get Pro later then that's good. Lots of people see buying Pro more as a donation towards the development of LW

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i installed lw and i guess i downloaded the wrong things later cause now i have 2 adult films in my itunes and im a kid and i didnt downlaod them but in my panic i deleted lm and now i cant reinstall it cause it says that its already there but its not and the videos r in Christian's Limewire tunes instead of inbox HELP PLZ srry for not posting on different boreds

I am unable to view the movie I have downloaded too. Have tried installing vlc player but still wont work. Anythng else I can do?