sureshot

Right but there have been post SP4 patches that can also install on top of SP3. SP4 might actually have older files than SP3 in some cases due to these hotfixes.

So I've been putting off installing SP4 and have been doing all of the other critical updates from windows updated for a while. Now I wonder if installing SP4 will undo some of the earlier fixes. Will it do this? If so, will it be smart enough to put them back in Windows Update to redownload?