Go to the official Microsoft Download Center and install the appropriate version of the Access Database Engine redistributable.
If you tried to run a 64-bit application that used the Jet 4.0 driver, you would get the infamous error:
Microsoft Jet OLEDB 4.0 provider is a legacy 32-bit database engine primarily used to connect to Microsoft Access (
Fix 1: Change the Target CPU in Visual Studio (.NET Applications)
: Configure your application to run in 32-bit mode (x86) rather than "Any CPU". Use 32-bit UDL
