Roger, Welcome to RetouchPRO!
According to
Jay Arraich's Photoshop Tips ---
Your Lighting Effects presets are gone, and you can’t save my own presets.
This is apparently connected with Windows XP’s Indexing Service.In Explorer, go to the subfolder found at Plugins > Filters > Lighting Styles. Right-click on this folder, and choose Properties. Under the General tab, click Advanced, then check the box that says 'For faster searching, allow Index Service to index this folder. After rebooting your computer, check to see if this has corrected the problem.
Hope this helps. Have you located the Lighting Effects folder on your drive? Mine is located at C:\Program Files\Adobe\Photoshop 7.0\Plug-Ins\Filters\Lighting Styles. If your folder is there (or near there), then hopefully this indexing "kink" is the only problem.