Solved: Error 0x800704dd running Windows Update

Frequently referenced as error 80240020. The fix depends on what version of Windows you use. Microsoft happily document each solution on its knowledgebase page here: http://support.microsoft.com/kb/910341/en-us

I wouldn’t bother blogging this, but the fix for Windows 2000, XP and 2003 involves adding a registry key that’s gone missing. Something happens to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\SensLogn, namely that it disappears. Not sure what’s causing it, but I’ve seen it on two PCs at work in the last week, and I quickly tired of re-typing the key information (there’s 14 different fields to fill in…).

Here for your (and my!) quick reference is SensLogn.reg. Right-click, save to anywhere, and merge with your registry on 2000, XP or 2003 to fix error 800704dd.

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