Are you refering to installing LW or a program you downloaded with LW?
Go to Start menu > Programs > LW > Uninstall. Uninstall LW is already installed. Then get this version:
Download ‘Other’ version & simply unzip & use!
* However, make sure Java is installed BEFORE attempting to run LW. Go to Add/Remove Control panel & remove any old Java versions then download from here
Download Java software from Sun Microsystems & install the OFFLINE installer version of Java. You may need to reboot after re-installing Java. Then proceed with LW.
BTW never use the Add/Remove programs control panel to uninstall LW. It will cause problems if you do.
(sorry for late response)