After loading LW, you must call NewTek to get the License Key. It's a lengthy number that you must record exactly as given. You then create a Simple Text doc with just the number and title it "License.key". You drag this document to "Programs" folder in the NEWTEK Folder containing LW.
You should be able to launch and run LW from that point on.
I suggest you keep a copy of the doc somewhere else as a backup.
Good Luck.