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.

Open Task Manager (ctrl/alt/del) & click on the Processes tab. Check if there's a LimeWire process running. If there is, end the process. Now, use your computer's search to look for all files & folders with limewire in the name & delete whatever you find. Restart your computer & see whether LW will install now. If you're still stuck, follow foolofthehill's advice here for removing all traces of LW.
Please hlp....(uninstalling and re-installing Limewire)

If you tried to uninstall the original LW via Add/Remove Programs, that's the wrong way & can cause problems. The way to uninstall is via start > all programs > limewire & use the uninstall option from there. Also, installing a new version will automatically remove the previous version, providing you haven't tried to uninstall it another way.