SP1 Windows Driver Foundation Error 3/missing

Hi,

After updating SP1 on Vista ult. NL 32b the:
"The Windows Driver Foundation - User-mode Driver Framework service"
is returning an error 3, missing / corrupted.
How can i re-install this service?
The dutch newsgroup has no answer in this case.

Vista won't install new USB devices at this moment, keeps searching for
drivers,
that can't be found..
Already installed usb devices work, but giving a continue search for
drivers,
witch vista cannot find.

Is there a tool like dialafix?
I'll not be happy if I have to reinstall windows completely for this "only".

Tnx,

MK