Overcoming security blocksThe Access database uses macros. These may cause your PC to block the application or hamper its functionality, depending on your software and security settings. Below are solutions to the issues we're aware of.
Cannot open the databaseThis problem is usually confined to Windows 7 or Vista users. The simplest solution is to unblock the file in the Properties tab. See these instructions for details.
Thanks to Peter Yoxall
Using the hills database in Access 2007 or 2010The default security setting in Access 2007 and 2010 is to block all macros. An attempt to use the queries may give a message in the status bar at the bottom. You need to select the Options button alongside the security warning message at the top, then select "Enable this content" in the panel that pops up. The queries will then work, but you will have to repeat the enabling process next time you open the file.
You can prevent the block by enabling all macros by default. If you are worried about creating a vulnerability, a better solution is to define a "trust centre" on your PC and put the file in that location. Instructions can be found in Converting to Access 2007 or 2010 (see yellow box at top right of page).
We have had no reports of issues with importing the database into other Access versions.