[Tex/LaTex] bibtex fails with error: “document.blg: Forbidden to open for writing”

bibtex

I am using a Windows Vista system. From the command line,

pdflatex ...document

works fine, with the expected errors about missing citations. It also reports:

No file document.bbl

which I assume is ok, because I think document.bbl is to be created by bibtex. However, when I run bibtex I get the error

document.blg: Forbidden to open for writing I couldn't open file
…document.blg

I thought bibtex created and wrote its own log file (.blg); so I am confused about how to proceed.

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