updates of the fires .. will sometimes.. flashing on your screen and with a choices of "Upgrade it now / Remind me later" something like that , if you upgrade your antivirus by using only by internet , instead of the virus will help you clean and repair your computer, it will give some virus on your files ,and it can cause of corrupted files
one more thing , if your upgrading your antivirus into a latest new version of your current antivirus and not paying it , .it will be not suitable for your computer , and it would not run correctly after it happen