The differences are not dramatic between basic & pro, so keep that in mind. Better sourcing is Turbocharged to my understanding. It gives you 'that much' more search power (always at the max of the app, with consideration of course to variables such as connection clarity.) Pro also offers a no. of xtras that are probably best seen from the site itself (unless you want to search the topic on the forum): http://www.limewire.com/english/content/features.shtml & http://www.limewire.com/english/content/download.shtml

Hope this helps to show what you can expect. Make sure you have the most recent version of Java for your OS. If you have problems somebody will help you out I'm sure. I'm not a pc person but a pc person will hopefully help out. Any other issues feel free to search the forum for your problems. Most of the same Q. have been asked before in one shape/form.