Hai provato a fare una semplice ricerca su google con un copia incolla dell'errore?

http://bugs.php.net/bug.php?id=25863

Observations
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This happened only when:
- PHP.exe is used as a CGI on IIS
- The php scripts contained 2 or more frames (e.g. phpMyAdmin)
- MySQL operation was executed (update, insert, delete etc.)
- header("Location: ...") is used to redirect user after a MySQL
operation to a page that also performs a MySQL operation
- The pages are viewed from local computer
- A very fast computer is used