I found a case where the Windows Photo Viewer was very slow to open, often hanging explorer.exe until it had opened. I found a solution here (new window): http://www.sevenforums.com/performance-maintenance/243435-windows-photo-viewer-very-slow-2.html
Run the following from an elevated command prompt:
del “%LOCALAPPDATA%MicrosoftWindowsExplorer*.db”
Windows Photo Viewer is slow to open
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