I am having the same problem, only I installed LimeWire and it won't even work. I tried uninstalling and then re-installing it, but I still get that "One or more necessary files appear to be invalid" error message. I didn't send the report to bugs@limewire.com though because the error message didn't give me that e-mail address. Which version of LimeWire are you running? I'm running v4.18.3 on a Windows XP Media Center Edition 2005 PC with 1 GB RAM and 500 GB disk space.

If you want me to send your report to bugs@limewire.com as well as mine I'll be glad to do that for you since your e-mail isn't working.

Thanks!