I want to uninstall IDM. How should I do this?

If you want to uninstall IDM, refer to Windows documentation to see how to uninstall programs. Usually you should go to "Start→Programs→Internet Download Manager→Uninstall IDM" for Windows XP or "Start→All Programs→Internet Download Manager→Uninstall IDM" for Windows 7. Uninstall is 100% working.

Uninstall IDM from 'Start' menu in Windows XP

Uninstall IDM from 'Start' menu in Windows 7

Alternatively, you may run "Uninstall.exe" file from "C:\Program Files\Internet Download Manager" folder.

If it still does not help, maybe you have damaged something when you tried to remove IDM manually. You should try to install IDM back and then uninstall it again as described above.

If you have Windows 7, Windows Vista, Windows 8 or Windows 10, you can read these pages from Microsoft which explain how to uninstall programs:

Also you may need to disable IDM plugin in your browser.