Can't join homegroup

I have 3 computers on my network running Windows 7.

I created a homegroup on one, and successfully connected to it from another.

On the third computer, however, I'm having some problems. If I try to join the homegroup the normal way, I get the message "Windows cannot set up a homegroup on this computer".

I checked into it, and found out the "Peer Name Resolution Protocol" service needs to be started for the homegroup to work properly. When I try to start it, I get this error:

This computer is running 7 Ultimate x86, upgraded from Vista Home Premium x86.
The computer that created the homegroup is running 7 Ultimate x64 upgraded from Vista Ultimate x64
The other computer that connected to the homegroup successfuly is running a fresh install of Windows 7


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