Access 2007 Security Warning
When you first open Microsoft Access 2007 you will likely come
across a security warning as shown below (Security Warning: Certain content in
the database has been disabled ):

The security warning will disable visual basic and macros within
the database. If you click the Options button you will be able to
temporarily bypass this security warning or you may permanently turn off the
security warning for this database location.
We will show you how to turnoff the security warning
permanently.
What is a trusted location?
From
Microsoft Office TechNet: The trusted locations feature of the 2007
Microsoft Office system enables you to designate folders on the hard disks of
users' computers or on a network share as trusted file sources. When a folder is
designated as a trusted file source, any file that is saved in the folder is
assumed to be a trusted file. When a trusted file is opened, all content in the
file is enabled and active, and users are not notified about any potential risks
that might be contained in the file, such as unsigned macros, ActiveX controls,
or links to content on the Internet.
To fix the security warning:
1) Click on the Options button at the end of the security
warning message and the Security Options window will display (see below).

Click the Open the Trust Center link in the lower left corner to
start the process of adding a new trusted location.
The Trust Center window will open as shown below.

Click on the Trusted Locations button as shown above... Then click on
the Add new location button in the window above. The Trusted
Location window will appear as shown below. Here you type in the location
(drive letter and folder name) of the location of the Access database.
Note that you can also use the Browse button to find the location and click to
add it to the list to avoid typing mistakes.