SPM:
I have never seen this problem myself but did a little reading and the general concensus is that someone has deleted/removed parts of the profile which is giving vista problems.
One fix I found for this was here:
http://www.answersthatwork.com/Downl..._correctly.pdf
However I would backup your machine beforehand or at least the user directory affected (Typically c:\users\xxxx where xxxx is the username) as it looks like it may remove your corrupted profile and allow vista to rebuild from the default profile.
Cheers
Jof