Deleted Virus & edited reg...now can't start Win Update service

I followed the following steps to remove a
virus "w32.maddis.b"...
I stopped the service:
a. Click Start > Programs > Administrative Tools >
Services.
b. Right-Click "Windows Update."
c. Set Startup type to "Disabled."
d. Click Stop.
Now after stopping the Windows Update & deleting the
infected USRINIT.EXE & HELPER.DLL & then I went into the
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es
and the deleted the "Windows Update" key.
In the removal instruction it also said to delete the
value: "WindowsUpdate" = "%System%\USRINIT.EXE"in
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersio
n\Run but it wasn't there.
I can't start it again the Windows Update again. I don't
know if I need to though.
I get "error 1058-The service cannot be started either
because it is diabled or because it has no enabled devices
associated with it". When I right click & try to gp into
properties so I can enable it I get "Configoration
Manager:A required entry in the registry is missing or an
attempt to right to it has failed.
Am I OK or do I need to set up the registry key for the
windows update...If I do can some one give me details of
what to do?

Thanks
Dawn