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Uninstalling antivirus software on a computer system is sometimes not a easy task as they tend to add their components deep into the system to provide protection from various threats PC users face these days. The need for antivirus software removal tools arises if the default uninstallation fails. This usually leads to a messed up computer system that could throw all kinds of errors at the user. It could also break other antivirus software either during installation or usage.

Note : Uninstalling an antivirus or any other program should always be done through "Add/Remove Programs" or by using a free third party uninstaller like Revo Uninstaller.
Only use the below methods if the "Add/Remove Programs" method fails.

List of Uninstallers or Removal Tools for Antivirus Software :

AVG Products
Avast Products
Avira Products
BitDefender Products
F-Secure Products
Kaspersky Products
BullGuard Products
McAfee Products
ESET Products
Norton/Symantec Products
Panda Products
G-Data Products
Trend Micro Products
Lavasoft Products
Sophos Products
Webroot Products
Microsoft Security Essentials
Zone Alarm Products
Vipre Products
DrWeb Products

there the comodo (unofficial) removal tool:

Link to the thread: https://forums.comodo.com/install-setup-...l#post_id4
Download link: https://sites.google.com/site/jacobcprt/...ects=0&d=1

old batch cleaning tool file thread : http://forums.comodo.com/install-setup-c...499.0.html

as i said they are unofficial since Comodo never released any removal tools, i used them many times without issues.

Thank you Jack sir for the uninstaller links. I also have a link for list of all Antivirus Uninstallers
http://kb.eset.com/esetkb/index?page=content&id=SOLN146

Hope this helps too