Another user with the same problem. LW installed cleanly, no errors.
I click on the shortcut or the .exe, the LW splash-screen pops up for about one second and then disappears. That's it. Nothing in the system tray, no LW no nothing.

Uninstall/Reinstall of LW does not help.
Running in Windows 2000 compatibility mode does not help.
Shutting off AV, Firewall, etc. - does not help.
Deleted the preferences folder as well. Does not help.
Tried reinstalling Java (offline) and the offline installer of LW. Stil nothing.