I did a little research but I can't confirm whether the Jet Database Engine is supported/installed under Windows 2012 Server. The Jet technology is considered deprecated by Microsoft. The provider library is msjetoledb40.dll and would be found under the
Windows\SysWOW64 folder. If the file is on the system and properly registered then I would suspect a permissions problem. The
Process Monitor utility is a good tool for troubleshooting.
The replacement for Jet is the ACE OLEDB Provider, which supports both 32 and 64-bit environments: