How do I reinstall correct update files?

Tech-Archive recommends: Fix windows errors by optimizing your registry



I have these files installed which I think are for an server that's no longer
attached (didn't think this PC ever saw it..but anyway)

ClientVersion: iuengine.dll = 5.4.3790.2182
ClientVersion: wuapi.dll = 5.4.3790.2182
ClientVersion: wuauclt.exe = 5.4.3790.2182
ClientVersion: wuauclt1.exe = 5.4.3790.2182
ClientVersion: wuaucpl.cpl = 5.4.3790.2182
ClientVersion: wuaueng.dll = 5.4.3790.2182
ClientVersion: wuaueng1.dll = 5.4.3790.2182
ClientVersion: wuauserv.dll = 5.4.3790.2180
ClientVersion: wucltui.dll = 5.4.3790.2182

These are the correct files for XP Home are they? How can I get the correct
ones back?
.