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The installation instructions are provided on the page you downloaded the zip file from
Mac or Windows? What version of the OS?
Did you apply the Photoshop 10.0.1 update?
What version of the Camera Raw plug-in?
Just in case you want to do a search on the Adobe knowledgebase or Google, it's the Adobe DNG Converter. There is no such word as "convertor" in the English language.
I rechecked that I had followed the instructions but it appears to have been only one batch of photos that was affected. I should have checked before writing but previously worked on files allowed me to open Camera Raw and some test files from this morning also work ok. A lot of stress and time wasted for nothing. I did learn how to spell converter properly though....