This article was previously published under Q277711
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When you update linked ODBC tables in a Microsoft Access database, an access violation occurs with the following message:
The instruction at '0x1b01a333' referenced memory at '0x0000000c'. The memory could not be 'read'.
This error message occurs when using Jet 4.0, and has occurred in both ActiveX Data Objects (ADO) and Data Access Objects (DAO) applications. The error can occur in a random fashion, and may not occur with every table update or in the same location each time.
Jet uses internal buffers for constructing the SQL UPDATE statement that is sent to the ODBC driver. An error in calculating the count of characters needed for the query causes a buffer overrun.
To resolve this problem, install the latest Jet 4.0 service pack. For additional information about how to obtain and install the latest Jet 4.0 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
239114 How To: Obtain the Latest Service Pack for the Microsoft Jet 4.0 Database Engine
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This problem was fixed in Jet 4.0 Service Pack 6 (SP6).
access violation av msjet40.dll update linked tables odbc dao ado