Block Executables . The blocking of executable programs as e-mail attachments, such as EXE and VBS files keeps these virus carriers at bay. Don't use self-extracting ZIP files to send or receive files. Instead use statically compressed ZIP files that need to be unzipped before they can be executed so they can be scanned for viruses. Be careful with downloaded software .
Software is widely available on the Internet and it can be infectious.
Not only pirated software but also software from well-established, credible vendors can contain viruses. Always scan any software you download from the Internet for viruses before you install it. Back up your data on a regular basis . While backing up your data won't protect you against a virus infection, it will allow you to protect your valuable data in case your computer becomes infected. Back up your most valuable data using external media storage devices.