After finally allowing my friends to talk me into getting limewire, I download, only to get a message saying something about the installers integrity check failing. I've already tried downloading it heaps of times, even the offline one, but the message won't go away, and i can't open it

Pleade help me!!!!!!!!!!

Sorry, new to this, didn't realise how much information was needed.

ummm i guess i'll jsut fill in the list. . .

1. windows 7
2. I just have the one firewall, called "windows firewall"
3. 4 gb of ram space
4. apparently I have 436 gb free out of 415. . . I thought i had a 4 gb computer? *sigh* obvioudly not a techie
5. Broadband (wireless. . . if that makes a difference)
6. Brand name of modem: D-Link number thingy: DSL-2740B
7. Trying to connect form my house
8. I believe the Limewrie thingy is Limewire 5 and my java thing says jre-6u20-windows-i586-s. . .not sure what that means but i hope it helps
9. I'm pretty sure the answer to that is Bigpond or windows internet explorer
10. Simple test failed It says "Oops! Internet Explorer could not connect. . ."
11. The internet connection? cos I'm sharing that with our home computer (this is my laptop), but the limewire connection is just me.
12. This is my first try at downloading Limewire, but I've tried to download it about five times, as well as the offline version.
13. I can't actually open it, "NSIS Error. . ."
14. Huh?!?
15. McAfee virus proptection or something. . . but i've disabled the firewall for limewire.
16. Currently living in Australia
17. I had never tried to download Limewire before, but nothing else has changed dramatically.

Hope that helps figure things out. . .Thanls to whoever takes the time to reply to this