error 1406 setup cannot write to registry

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Hello to all,

I had recently upgraded one of my users to Office 2007 (with admin rights);
everything was working fine untill one day he goes to run excel again and it
gives him a fatal error. The error code is error 1406 (Setup cannot write the
value Content Type to the registry key \.xlsx. I have tried to go to the
registry editor to double check permissions but it still won't run. Any
information would be greatly appreciated, thanks you
.

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