If you type "spongebob episodes online" into your search engine you'll get a few come up saying you can watch them all and/or download for free. I haven't checked any of these sites so dont know how safe they are - therefore, open at your own risk.
You can try this link.
spongebob.com It has complete episodes. You can change your kaspersky into avira anti virus. You can download the avira free. Search Avira anti virus personal in Yahoo. If you have other questions just PM me.