For Windows 2000 and Windows XP

To uninstall IncrediMail use Control Panel Add/Remove Programs ad select remove and follow the prompts.

After that is complete you'll find there is still a lot of Incredimail remnant entries still left in your system.

After completely uninstalling as noted above you need to remove unneeded IncrediMail files and settings. IncrediMail stores data in three locations the User profile, programs directory and the registry. To completely remove IncrediMail you must remove the data from all three locations as follows:

IncrediMail stores user related data in the user profile in the - documents and settings\username\local settings\application data\Im folder where is the name of the user you log on as. Deleting the IM folder will delete all your IncrediMail emails, letters etc if you want to keep them you can rename the folder to IM-old or similar

Incredimail executables etc are stored usually in c:\program files\Incredimail. Navigate to this folder and delete it.

To delete the registry keys for the IncrediMail program

Open the Registry Editor Start > Run and type Regedt32.exe into the run box.

For each key that you need to delete, locate the key, right-click the key, and then click Delete:

Under the HKEY_CLASSES_ROOT key, delete the following keys:

\.ima

\.imf

\.imi

\.imn

\.ims

\.imw

\Applications\Impcontent.exe

\Applications\Incredimail

\Incredicontent

\Incredimessage Under the HKEY_LOCAL_MACHINE key, delete the following keys: Software\Classes\.imc

Software\Clients\Mail\Incredimail

Software\Elishim\Protect\Browser (remove the Incredimail value)

Software\Incredimail

Software\Microsoft\Direct3D\Most Recent Applications\ (remove the NAME value that points to Incredimail.exe)

\Microsoft\Windows\CurrentVersion\App Paths\Incredimail Delete the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ MenuOrder\Start Menu\Programs\Incredimail key. Quit Registry Editor.

Reference http://support.microsoft.com/default.aspx?scid=kb;en-us;297069

Incredimail should now be completely removed from your system

More detail here http://www.oeupdates.com/Uninstall-remove-IncrediMail.html