1. Click the 'Start' button, then click 'Programs' or 'All Programs,' then click 'Accessories'.
2. Click the command line icon (if running Windows XP) or right-click the command line icon. Select 'Run as Administrator.'
3. Type 'sfc /purgecache' on the command line and press the 'Enter' key. All files in the DLL cache have now been deleted.