Jake,
Open Add/Remove Programs in the Control Panel to see if KB828741 is
listed.
Go here :
http://www.microsoft.com/technet/security/bulletin/ms04-012.mspx
Under the " General Information " heading click the plus sign next
to Security Update Information, click the plus sign next to
Windows XP (all versions). Scroll down to " File Information " and
compare the versions of these update files - Rpcrt4.dll and
Rpcss.dll with the files on your system (located in the
WINDOWS\system32 folder; make sure you choose pre-SP1 or with SP1 to
match your installation ).
Right click the files, choose Properties, click the Version tab. If
these files match, the update is showing in Add/Remove Programs in
the Control Panel, and the registry key matches (it is given on the
above page under "Verifying Update Installation") then the update is
installed and not being detected by the Windows Update site.
KB828741 not being detected is not a known issue .
MowGreen [MVP]
*-343-* Never Forgotten