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HP and Compaq PCs - ENTER Key on Keyboard Does not Work

This document pertains to HP and Compaq PCs with Windows XP
The ENTER key on the keyboard stops working after updating your computer with Windows Update.
To resolve this issue, restore the proper keyboard data into the registry using the following steps:
  caution:
The steps in this document involve editing the registry. Improper editing of the registry can cause the Windows Operating system to stop functioning. Use caution when performing the steps that follow.

Step 1: Backing Up the Registry

Use the following steps to create a backup of the windows registry. This backup can be used to restore Windows back to the way it was if something goes wrong while editing the registry.
  1. Click Start, Run, and type the following into the Open field: regedit
  2. Click OK.
    The Registry Editor window appears.
  3. Select My Computer in the left window, click File, and then Export.
  4. Type a name for the backup file into the File Name field. A good name is one that includes a date in a number, hyphen, number format (for example, regbackup_02-25).
  5. Click Save to save the backup file to the default folder, usually My Documents.
    The backup can take some time before it completes. Wait until the Registry Editor window displays the registry information before attempting to continue.

Step 2: Adding a Scancode Map value

Use the following steps to re-add the correct Scancode Map value to the registry:
  1. With the registry editor still open, click the plus sign (+) next to each of the following registry keys (folders):
    • HKEY_LOCAL_MACHINE
    • SYSTEM
    • CurrentControlSet
    • Control
    • Keyboard Layout
  2. Select the Keyboard Layout key by clicking on the folder.
  3. Click New, and select Binary Value.
    An icon labeled New Value is added to the right window.
  4. Right-click the New Value icon and select Rename.
  5. Type the following text: Scancode Map
  6. To enter the new name, click the Keyboard Layout key in the left window.
  7. Double-click on the Scancode Map icon that you just created in the right window.
    An Edit Binary Value window appears.
  8. Type the following sequence of numbers and the letter C in the specific order given:
    00 00 00 00 00 00 00 00 02 00 00 00 00 00 1C 00 00 00 00 00
    The sequence of values should appear exactly as shown in Figure 1.
  9. Click OK when done.
    Figure : Correct binary values

Step 3: Removing the Scancode Map value

Use the following steps to restart the computer and remove the Scancode Map value:
  1. Close the Registry Editor and restart the computer.
    note:
    Restarting the computer is an important step that must be done before the value is actually accepted by Windows.
  2. Click Start, Run, and type the following into the Open field: regedit
  3. Click OK.
    The Registry Editor window appears.
  4. Click the plus sign (+) next to each of the following registry keys (folders):
    • HKEY_LOCAL_MACHINE
    • SYSTEM
    • CurrentControlSet
    • Control
    • Keyboard Layout
  5. Select the Keyboard Layout key by clicking on its folder.
  6. Select the Scancode Map icon in the right window.
  7. Press the DELETE key on the keyboard to remove the Scancode Map value.
  8. Close the Registry Editor and restart the computer.
    The ENTER key should work properly now.
note:
In the event that something was entered wrong or the keyboard stops responding, use the registry backup file that was created at the beginning of this document to restore Windows to the way it was. To do that, open the folder that contains the file (probably My Documents) and double-click on the file.

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