Go to Google or Microsoft and type "deactivate access security" that will take you to the following link:
http://support.microsoft.com/support/access/content/secfaq.asp
Here is the relevat part...
34. How can I "de-secure" a database?
You must have Administer permissions and/or be a member of the Admins group in the workgroup information file that helped protect the database. Grant full permissions to the Users group and the Admin user account. Put the Admin user back in the Admins group and remove the password from the Admin user. You will not be prompted for a logon ID and password once the password is removed from the Admin user. Optionally, you can also run the Security Wizard again to transfer ownership of all objects back to the Admin user, but the wizard will also remove permissions from the Users group, which you may not want.
jdg