I have noticed many times after few weeks my browser's search engine gets changed to some conduict search engine. But today i found a reason I found some suspicious third party software and when i googled it got confirmed that it was the reason
Name of that file is NvSTECH toolbar
But now my problem is when i try to uninstall it in Control Panel\Programs\Programs and Features this location nothing happens (I tried many times) i did a full PC scan with windows defender but it couldn't find it so i don't know what is path to that NvSTECH toolbar file(or program) so i can't even delete it.
If possible tell a way other than downloading any Anti adware