Not responsive

Guys I have the dell inspiron 13 7000 here are the specs- intel i7 5500u 2.4GHz, 8 gb ram I just want my laptop to be responsive...........here is one problem that I face- whenever i increase/decrease the volume with the f3 and f2 respectively the function starts but when I leave the key the...

I tried to scan for viruses but there seems to be an error and scanning takes a very long time because of how slow my computer is right now. I can barely move my mouse without it freezing constantly, programs literally take 5-10 minutes to start up, and it just annoys me how slow this is. I...