Member Avatar for jaz854

Hi All,

I am getting the below error message when I try to degug my program.

The 'Migrosoft.Jet.OLEDB.4.0' provider is not registered on the local machine


Thanks in advance.

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  • Latest Post Latest Post by JSS at MSSU

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A short, practical summary and what actually fixes it.

The error means the process tried to use the native Jet OLE DB provider but could not find a registered 32‑bit provider it can load. Microsoft.Jet.OLEDB.4.0 (the Jet engine) was released as a 32‑bit OLE DB provider and is not available to a 64‑bit process; that mismatch is the usual root cause. (learn.microsoft.com)

If you control the app: run it as 32‑bit. For VB/.NET projects set the project’s platform to x86 (or use “Prefer 32‑bit”) so the CLR runs 32‑bit on a 64‑bit OS. For web apps on IIS, use an application pool with “Enable 32‑Bit Applications = True.” Those changes let your app load the Jet provider that is already on the machine. (learn.microsoft.com)

If you need a true 64‑bit solution, move to the Access Connectivity Engine (ACE) provider (Provider=Microsoft.ACE.OLEDB.12.0 or 16.0) and install the matching Access Database Engine redistributable for the bitness you require. Example connection strings:

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\path\file.mdb;
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\path\file.accdb;

Install the appropriate ACE redistributable rather than expecting Jet to appear in a 64‑bit process. (microsoft.com)

A few cautions so effort isn’t wasted: ACE comes in 32‑ and 64‑bit flavors and the engine’s bitness must be compatible with installed Office/Click‑to‑Run tooling — you can’t safely mix 32‑bit Office with a 64‑bit ACE engine on the same machine without special measures. Click‑to‑Run Office installs can also hide ACE from external apps. If that combination is present, the least disruptive fix is still to run your app as 32‑bit or use the Microsoft 365 Access Runtime/appropriate redistributable. (learn.microsoft.com)

Notes on the thread: ’s direction to force a 32‑bit build is the most reliable quick fix for many scenarios; ’s “add reference” suggestion can be misleading—Jet isn’t a managed .NET assembly you add as a project reference, you consume it via ADO.NET’s OLE DB provider (System.Data.OleDb) and a connection string. (learn.microsoft.com)

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Member Avatar for preetham.saroja

just goto, project click on "add references " and select "jet oledb..." from the list and click on it..
Then it has to work& if "jet oledb..." doesnt exists in the list of refrences then the software have to be installed.....

Member Avatar for JSS at MSSU

You don't say in which language or operating system, but I've had that recently (after going to Win 7 x 64). My VB2008 applications that read/write MS Access files wouldn't work. You need to modify them to compile for 32bit. (MS Access shows no interest in becoming a 64bit product.)

From the Build Menu ==> Configuration Manager ==> Active Solution Platform ==> Add ... (x86)

You may also need to add a runtime argument for the compiler (My Project - Debug - COmmandLine Arguments) of

-define:_MYTYPE=\

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