I have tried several times to load limewire and even purchased pro but it continues to give the same message. It tells me to download and reinstall. Please help?

Try updating your Java (or reinstalling, if you already have the latest update): Java Downloads for All Operating Systems - Sun Microsystems
Download the JRE offline installer & remove any other Java versions (via Control Panel) before installing this one. Restart your computer after installing the new Java.

If that doesn't fix things, delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will change all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.
Vista users: LimeWire Pref Folder in Vista

And if that doesn't help, right click on the LW icon > properties > compatibility. Try running in compatibility mode for Win 2000 or NT. Vista users, right click the LW icon & run as adminstrator & also try compatibility mode for XP.

Maybe these links below don't relate to your problem, but just in case...

Do you have Alcohol software installed? If so, look here.
LW starts then close, log: resolve_virtual_call

You could also try the advice here: FIX: LimeWire won't start or closes immediately

If you're still stuck, uninstall LW & try the cleaner apps in the thread below. But only uninstall LW Pro if you have the installer saved, or if you're sure that you can download a new Pro installer ( just in case you purchased Pro from a scam site & end up not being able to download a new Pro installer )
http://www.gnutellaforums.com/333278-post2.html