Antivirus Swaps

People if you get a message your antivirus is outbid date, for instance you get a 3 month subscription to McAfee or Symantec and it runs out, you need to uninstall it before you put on something else. If you do not, they will fight and scan the same files and cause your system to be really slow. 

Uninstall AV first then install new Antivirus.