To delete the configuration files and local copy of your account:

Double click on My Documents.
Right-click on the Battlefield 2142 folder and choose Delete.
To delete the game files (in the default location):

Open My Computer.
Open the Cdrive.
Open the Program Files folder.
Open the EA GAMES folder.
Right-click on the Battlefield 2142 folder and choose Delete.
Go to the following folder: C:\Program Files\InstallShield Installation
Information (If you cannot find this folder you may have to go to Tools >
Folder Settings and click the setting to SHOW hidden folders.)
Right-click on the folder named {ED50ECE9-EC54-4C05-B5ED-EE4741A9F2EC} and
choose Delete.
Close all open windows.
Right-click on the Recycle Bin and choose Empty Recycle Bin.
To edit the registry and remove Battlefield 2142:

Click on the Start button.
Click on Run.
Type regedit in the text field.
Click File and then choose Export.
Name the file Backup and make sure the Export Range is set to All.
Click Save; you will now be returned to the Registry Editor window.
Click the plus sign next to HKEY_LOCAL_MACHINE.
Click the plus sign next to Software.
Click the plus sign next to EA GAMES.
Right-click on the Battlefield 2142 folder and choose Delete.
Back under Software, click the plus sign next to Electronic Arts.
Click the plus sign next to EA GAMES.
Right-click on the Battlefield 2142 folder and choose Delete.
Just above EA GAMES you will see a folder named EA CORE, click the plus sign
next to EA CORE.
Click the plus sign next to INSTALLED GAMES.
Click the plus sign next to EA GAMES.
Right-click and choose Delete on any Battlefield 2142 folders.
Click the plus sign next to Microsoft.
Click the plus sign next to Windows.
Click the plus sign next to CurrentVersion.
Click the plus sign next to Uninstall.
Right-click on the key named {ED50ECE9-EC54-4C05-B5ED-EE4741A9F2EC} and
choose Delete.
A Confirm Key Delete window will appear, choose Yes.
Close the WindowsRegistry Editor.

Battlefield 2142 is now completely removed from your system. You may now
reinstall the game.