In my experience in helping this identical problem with LW is that a total re-installation of Java, FW & deletion of the prefs fixes it.

By uninstalling Java I mean, use the add/remove control panel to remove Java. Then use the "Offline" installer for Java. If that doesn't fix it, then uninstall it again & instead, install Java 1.4.2 ("offline")
Use the LW reference link point #1 Fixes for Limewire for Java version links.

Delete the FW prefs folder as discussed. (Don't have a clue why you can't find it.)

Reinstall FW. If necessary, uninstall it from the Start menu>Programs>FW>Uninstall. If all fails ... Then get the "Other" version which you simply unzip & use.

(Sorry, I reposted because I realised I forgot to include a sample image duh sorry! I didn't realise you had responded!)

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