I REALLY need help!!

[mmmzeppelin]

I'm having a problem with my Limewire and I was wondering if anyone could help me out.
I've had Limewire for a pretty long time, about a year. It's always ran fine, but today when I went to open it, a box came up that said that Windows couldn't find the file that had created it. The options were to open it with another program, or to use the internet to find the file that had created it. The problem is, even if I could find the file on the internet, I dont actually know the name of the file that runs Limewire.
I tried changing users, to see if it ran on the other users on my computer, but when I tried it on those other ones, all that happened was when I clicked on the icon, it opened as a picture with Windows Picture and Fax Viewer. After that, when I went back on to my user, it did the same thing, and thats as far as I've gotten.
If anyone knows how to fix whats happened, please tell me.