See if this is pertinent:
Error message when you use the Windows Update Web site or Microsoft
Update Web site to install updates: "0x80070017"
> This issue may occur if there is a cyclic redundancy check (CRC) failure during the update process.
> This failure may occur if the received file is not the file that is expected by Windows Update
The KB suggests running chkdsk first, then to rename the
Software Distribution\Download subfolder.
If there have been no such cyclic redundancy errors before, suggest you
manually download and *save* the update from the links in the KB
Close the browser and any other open programs first, then install it.
It should require a reboot. It did not on my Vista system, did on my XP
and Windows 7 systems. YMMV.
"Security updates should *never* have *non-security content* prechecked"
> KB976749 is not installing on my Server 2003 machine.
> The release notes indicate that the patch should only be applied to a
> machine already patched with KB974455. I checked before attempting to apply
> this patch that 974455 had already been applied.
> Error code 0x80070017 shows following attempted installation from Windows
> Local download and install attempt yields an error message saying "Data
> Error (Cyclic redundancy check)" followed by installation not complete.
> Any assistance on this would be appreciated.