Changing security

I have always opened my imaac by just putting enter into the password.  I now want to change the security settings, but it will not accept the enter when I put it in.  I have just changed to Mountain Lion and it will not now accept the apps for my Epson printer which I need to update and says I must change my security.  Can anyone help please

I'm afraid you will have to reinstall from scratch, then.
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on
      the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security button and set the Zero
        Data option to one-pass. Click on the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
When you boot into the Startup Assistant and create your initial account be sure to assign a proper password. Also be sure to use the same username that you are now using.

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    Connect the iOS device to your computer and try to make a backup
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    If recovery mode does not work try DFU mode.
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    For how to restore:
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