Vista - Delivery Manager has stopped working

Using Vista Home Premium, whenever I boot up and log on, I get the message
above with the additional text "Windows is collecting more information about
the problem. This might take several minutes... "

After a while, the additional text changes to "A problem caused the program
to stop working correctly. Windows will close the program and notify you if
a solution is available".

I usually press the 'Close Program' button and continue, without any obvious
adverse effects.

Does anyone understand why this happens & know how to fix it?