Windows 7
 

Can somebody please tell me if limewire pro 5 is compatible with windows 7?

I guess so. Win 7 is included in the list of OSs for the Windows platform: Get LimeWire for Your Platform - Lime Wire

You might find some more info here (click on link): LimeWire Forums
Check out the LimeWire 5 and Bugs & Beta Testing sections - I think some Win 7 users have posted there in the past.

If you're not currently using a Pro version, maybe try the basic (free) 5.3.6 before buying Pro;) Just remember that unless you have LW's installer saved, you'd lose whatever version of LW that you use now if you update to the latest basic version!