To repair the ACS on a computer running Windows Vista, take the following steps:

1. Click the Start globe, in the search box type services.msc and press Enter on the keyboard.
2. Click Continue at the prompt.
3. In the list of sevices, locate AOL Connectivity Service. Then, right-click it and select Stop.
4. Close the Services window.
5. Click the Start globe again and select Control Panel.
6. Select Classic View from the panel on the left and double-click Folder Options.
7. Select the View tab and ensure that Show hidden files and folders is selected.
8. Untick Hide protected operating system files and click OK.
9. Click the Start globe again, and this time select Computer.
10. Double-click Local Disk (C:), and then double-click the Program Data folder.
11. Double-click AOL and then double-click ACS.
12. Right-click the folder labelled 1.0 and select Delete.
13. Click Yes to confirm the deletion and restart the AOL software. Then, follow the steps below to set up a new broadband location.

To repair the ACS on all other versions of Windows, take the following steps:

1. Right-click the AOL icon in the system tray (in the bottom right-hand corner of the screen, next to the system clock).
2. Select One-Click Fixes.
3. Locate Repair ACS and click the Fix it For Me button next to it.
4. Click Continue.
5. Once it has completed, click Done. Then, follow the steps below to set up a new broadband location.