In this forum here , someone mentions that Entity Framework does not work with Access (Jet DB - .mdb). However it seems that there is a provider for Jet DB as described here
Entity Framework does not support OLEDB connections, so your connection string will not work. It is practically impossible to get Entity Framework to collaborate with MS Access. You will either need to dump the MS Access part of your design, or the Entity Framework part.
The closest you could get using MS Access is using strongly typed datasets and Linq-to-DataSet http://msdn.microsoft.com/en-us/library/bb386977.aspx
Or, considering going with SQL Express instead (it's free) http://www.microsoft.com/sqlserver/en/us/editions/2012-editions/express.aspx
There is a MS Access EF 6.1 provider here
https://jetentityframeworkprovider.codeplex.com/
EDIT
Now the EF provider for Access is hosted on GitHub
https://github.com/bubibubi/JetEntityFrameworkProvider