well that is a basic read/write error in mysql..
check:
MySQL :: MySQL 5.0 Reference Manual :: C.5.2.13 Can't create/write to file
if you read a little lower.. you will find:
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If you get an error of the following type for some queries, it means that MySQL cannot create a temporary file for the result set in the temporary directory:
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but it can be something else...(specially on windows)
Like antivirus scanning mysql tmp directory etc. etc.
There are some hints posted by users on that page to work around..
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Turning "off" the scanning of windows/temp folder in the anti-virus resolved the issue for me.
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or...
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If you are running Microsoft Security Essentials on Windows, here's a way to fix the issue.....
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Luc
PS once you turned off all antivirus run that step again:
http://localhost/admincp/vbgallery_i...pgradesettings
(PS2: I assume you are running apache on windows as localhost)