KB941600 Will Not Install

I am running Vista Home Premium SP1 32-bit and have intermittent
problems with "STOP 0x000000FE BUGCODE_USB_DRIVER" when coming out of
sleep mode. In an attempt to fix this problem I downloaded and
attempted to install KB941600, which is described by MS as:


Article ID 941600 - SUMMARY - This article describes an update rollup
that resolves some reliability issues in the USB core components in
Windows Vista. You will achieve better reliability in various scenarios
by installing this update.

....

930568 (http://support.microsoft.com/kb/930568/) Error message when you
try to put a Windows Vista-based computer to sleep or into hibernation:
"STOP 0x000000FE BUGCODE_USB_DRIVER"

The following files are available for download from the Microsoft
Download Center:

APPLIES TO
.. . .
Windows Vista Home Premium

Windows Vista, 32-bit versions
Download the 941600 package now.
(http://www.microsoft.com/downloads/d...3-5200B7EF497B)


I entered the Genuine Windows Validation code and downloaded
Windows6.0-KB941600-x86.msu. When I run KB941600 I get a dialog:

Windows Update Standalone Installer

The update does not apply to your system.


I have not previously applied this rollup.

Looking for suggestions as to why I cannot apply KB941600.