From access help:
Stop Disabled Mode from blocking a query
If you try to run an append query and it seems like nothing happens, check the Access status bar for the following message:
This action or event has been blocked by Disabled Mode.
To stop Disabled Mode from blocking the query, you must enable the database content. You use the Options button in the Message Bar to enable the query.
Enable the append query
In the Message Bar, click Options.
In the Microsoft Office Security Options dialog box, click Enable this content, and then click OK.
If you don't see the Message Bar, it may be hidden. You can show it, unless it has also been disabled. If the Message Bar has been disabled, you can enable it.
Show the Message Bar
If the Message Bar is already visible, you can skip this step.
On the Database Tools tab, in the Show/Hide group, select the Message Bar check box.
If the Message Bar check box is disabled, you will have to enable it.
Enable the Message Bar
If the Message Bar check box is enabled, you can skip this step.
Click the Microsoft Office Button , and then click Access Options.
In the left pane of the Access Options dialog box, click Trust Center.
In the right pane, under Microsoft Office Access Trust Center, click Trust Center Settings.
In the left pane of the Trust Center dialog box, click Message Bar.
In the right pane, click Show the Message Bar in all applications when content has been blocked, and then click OK.
Close and reopen the database to apply the changed setting.
Note When you enable the append query, you also enable all other database content.
For more information about Access security, see the article Help secure an Access 2007 database.