CS5: Installing Bridge update 4.0.1 does not work

• PS/Bridge CS5, WinXP/SP3, German edition
  
• Adobe Application Manager shows availability of Bridge update 4.0.1
• Click on the update button in the right corner below (Adobe Application Manager window)
  
• Message appears (translated from German into English): "Another instance of Updater is already be executed. Repeat the process at a later date."
• Reinstall of PS/Bridge CS5 did not help

Thank you