How to update my antivirus software

• Updated version of Antivirus
• Anti virus update

Check whether the REGULAR UPDATES in your antivirus software is enabled or not. 
How will you check that? 
Launch your antivirus software which you will easily find by clicking on Start>Program Files. Look for update option on the software window. If you see update option is enabled (maybe you will see this option checked) then your antivirus software always gets updated. If you see this option disabled then enable it.