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This process isn't complicated, but it does involve several steps. Start by setting folder options to display both hidden files and protected operating system files. After making sure you've backed up any Outlook Express data if necessary, rename the following folders, adding _old at the end of each:

C:\Program Files\Common Files\MicrosoftShared\Stationery
C:\Documents and Settings\username\ApplicationData\Identities
C:\Documents and Settings\username\Local Settings\ApplicationData\Identities
C:\Documents and Settings\username\ApplicationData\Microsoft\Address Book
C:\Documents and Settings\username\Local Settings\ApplicationData\Address Book
Next, open the Registry Editor, and delete the following keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\OutlookExpress
HKEY_LOCAL_MACHINE\Software\Microsoft\WAB
HKEY_CURRENT_USER\Identities
HKEY_CURRENT_USER\Software\Microsoft\Outlook Express
HKEY_CURRENT_USER\Software\Microsoft\WAB
HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\InstalledComponents\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}
HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\InstalledComponents\{7790769C-0471-11D2-AF11-00C04FA35D02}
Finally, search for and rename the following files. Note that each file resides in two locations. Rename both copies, adding _old to the end of each.
Inetcomm.dll
Msoeacct.dll
Msoert2.dll
Msoe.dll
Msoeres.dll
Msimn.exe
Oeimport.dll
Oemiglib.dll
Oemig50.exe
Setup50.exe
Wab.exe
Wabfind.dll
Wabimp.dll
Wabmig.exe
Csapi3t1.dll
Directdb.dll
Wab32.dll
Wab32res.dll
This solution contains information on how to edit and modify your Windows Registry. It is always recommended that you take a backup of the Registry before editing any of the values because any improper editing can cause strange behavior and at worst could even corrupt your operating system completely, requiring you to re-install Windows


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Hi Uttam,

What is your operating system? You can try these steps:

Step one: Precondition:

* Please make sure that you are using NTFS format
* Make sure that you didn’t set the file sharing
* Assure that you are running as Administrator

Step Two: Start the removal process

Please log in with the member account in the users group. And then open the Local Disk C, find out Program Files folder and open it. Then right click the Outlook Express folder and select Properties. Then the Outlook Express Properties windowws pops up. Please choose Advanced, next please checked the Inherit from parent the permission entries that apply to child objects. Include these with entries explicitly defined here. Then choose Remove in the next pop up meassage. Finally please click OK and close the windows. Next please go back to the Advanced Security Settings for Outlook Express, add the current member account to the Permission entries. When you finish all the steps, please close them.

Source: http://www.onlinepcsavior.com/how-to-uninstall-outlook-express-completely-from-windows-xp/