If you right click on the shortcut that you are using to start LimeWire, you should be able to select "Properties." From the properties window you should see the "Target" field listing:

"C:\Program Files\JavaSoft\JRE\1.3.1\bin\javaw.exe" -cp . RunLime

Try changing this to read simply:

javaw.exe -cp . RunLime

This should solve the problem.

Is this happening with LimeWire 1.6?

Is your "Program Files" directory somewhere other than "C:\Program Files"?

Thanks.