But to continue this process have you installed best anitivirus or using Free edition Anitivirus softwares.
It is better to focus daily or weekly to fix Antivirus updates to protect from malwares, etc.
Mostly troubles arise when system is not updated anitivirus or renewals after license period over.
Here another Antivirus tool available from 'Avast' which is best compatible for every Home PC.
You can fix antivirus immediately or leave to Avast antivirus itself to remove corrupt files from your PC.
Avast Antivirus tool available at free of cost users can download and protect PC.
Free Download Avast Antivirus 2014