Need Help Badly!(older version of LW running)

[Jody.Cave]

I have the older version of Limewire on my computer. I am trying to download the newer version 4.14.8 and a setup pop-up keeps showing telling me "An older version of Limewire appears to be running. You must exit the old version before continuing with installation. Once you have exited Limewire, click Retry. (Note that Limewire may be running in your system tray (next to the time). To exit, right-click on the lime icon and choose "Exit".)"

Now, my problem is, I cannot right-click on it. I cannot open it. I can't even delete the file from in my Program files. Could someone please help me. This is driving me crazy.