The OP has both because even with a slipstream of WMP9, Microsoft Update and Windows Update Agent both tell the user they need to install KB925398 and KB954600. Slipstreaming these updates resolves KB925398 but not KB954600. I just got done using HFSLIP on a Windows 2000 CD whose only customization prior was a slipstream of SP4. I was able to slipstream every other update, plus DX9 plus IE6 plus all the Microsoft Update cabs, etc., but this is the last update that remains. I seem to remember something somewhere on these forums about a similar problem with a Windows XP update that had to be put in one of the other HFSLIP folders, but I can't remember which update it was and what folder it went into. EDIT: It was either KB955839 or KB952069 and it went into HFSVCPACKS_SW1. EDIT: Just tried the /quiet /norestart switches (which is what HFSVCPACK_SW1 is for) and I think everything went according to plan because I didn't get an error dialog about using unsupported switches. Going to restart the HFSLIP process and see if this is the trick. But it's time for bed, so it might be a while before I can confirm.