Hellow everyon, I'm using calmwin free antivirus with avast free antivirus.. but the problem is that, my avast antivirus is detecting calmwin as a virus.. I even have uninstalled avast antivirus.. but it's still showing popups to remove calmwin and when i try to uninstall avast from program and features it don't apear there.

It's look like your avast antivirus is infected or corrupted and is not uninstalled properly, I suggest you to uninstall your avast antivirus now with the help of avast removal tool..
Follow steps to remove your avast antivirus properly.
1. Install avast again with the help of avast offline installer
2. run avast removal tool
3. reboot your computer
4. and you are done.

Can you please give me a link to the avast offline installer and avast removal tool ?

Sure, Here are the links..
Avast offline installer : https://althow.com/avast-offline-installer/
Detailed article about How to uninstall avast antivirus : https://althow.com/howto-uninstall-avast-antivirus-remove-avg-windows-7-8-10/

thank you

You can report the erroneous detection to Avast. They can correct their signature, and you can still use both Avast and ClamWin.

Regards,