I was trying to update an Access database from a classic ASP page and encountered this error:

[Microsoft][ODBC Microsoft Access Driver] Operation must use an updateable query.

The fix is outlined here:

http://support.yessoftware.com/kb_article.asp?article_id=72

In a modern OS, you need add the local IUSR account to the folder that holds your database.  The account will need read and write access.

Who knew that classic ASP was so much fun to work with?