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When I fire up my limewire from my desktop, I get an error which says it can't find my Java Runtime Environment.

Any tips or hints how I can resolve this.

i have installed the latest Java on my machine.

My suggestions would be:

1. Open Add/Remove control panel & remove all versions of Java you have.

2. Reinstall Java using only the "Offline" Java version from here Java 1.5 (take the JRE)

3. Delete your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included.)