There are many type of Antiviruses MOst of Them are Paid And some of them are also available in free mode. To download Paid antiviruses at free of cost click her,
After insatllation of antivirus The next problem is updating the database of your antivirus. To update the database You require connection of internet. If Internet connection is break down in between the updating process then it will show an error and you will have to update from start and your efforts going to waste. And if you have more than one desktop without network and you want to update database on each.
now here the sol.:-OFFLINE update of database of your antivirus.
here simple steps
download updating file from
Avast
Download here
Kaspersky Download here
Avira Download here
Norton Download here
Quick heal Download here
AVG Download here
Panda Download here
Mcafee Download here