Can I uninstall 360 total security?

I am not that familiar with technology so please bear with me. I am not sure if I clicked something when I scroll through websites that downloaded this security app or my laptop automatically downloaded it but since I have this app my laptop has been running slow and it always pop up unnecessary stuff like news and the one that you see in the attached picture. These pop ups get so annoying when it refuses to close and you have to wait for a few seconds for it to actually close.

I am not that familiar with technology so please bear with me. I am not sure if I clicked something when I scroll through websites that downloaded this security app or my laptop automatically downloaded it but since I have this app my laptop has been running slow and it always pop up unnecessary stuff like news and the one that you see in the attached picture. These pop ups get so annoying when it refuses to close and you have to wait for a few seconds for it to actually close.