I just spent a few "happy" hours on a computer that would download updates but not install them (or leave an error message in the online Update History). It turned out that a whole little section of the Registry was missing:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\SensLogn]

"DLLName"="WlNotify.dll"

"Lock"="SensLockEvent"

"Logon"="SensLogonEvent"

"Logoff"="SensLogoffEvent"

"Safe"=dword:00000001

"MaxWait"=dword:00000258

"StartScreenSaver"="SensStartScreenSaverEvent"

"StopScreenSaver"="SensStopScreenSaverEvent"

"Startup"="SensStartupEvent"

"Shutdown"="SensShutdownEvent"

"StartShell"="SensStartShellEvent"

"PostShell"="SensPostShellEvent"

"Disconnect"="SensDisconnectEvent"

"Reconnect"="SensReconnectEvent"

"Unlock"="SensUnlockEvent"

"Impersonate"=dword:00000001

"Asynchronous"=dword:00000001

My suggestion is that dial-a-fix should check that the SensLogn key is present and, if possible, insert the appropriate values if it is not.

Was on my to-do list already. Having a hard time getting to work on Dial-a-fix lately.