It all starts from your own PC. Whether you want to buy or sell anything online, make sure your PC is clean from viruses, spywares, trojans and malwares. Make sure the software in your PC are up to date. Make sure you are using latest OS. Make sure Antivirus in your PC is up to date. Make sure you have Firewall installed. For PayPal users, essential and critical security measures you might have missed are given below to help you protect online when you shop using your PayPal account.