DO:
Install a trusted antivirus and update it regularly.
If you felt your PC got virus infection, do a full antivirus scan.
Keep a backup of all your personal information and files on external media.
Scan all email attachments before opening them.
Download programs from trusted sources only and scan them before installing them.
DON'T:
Don't participate in distributing viruses over the Internet.
Don't download programs from suspicious website as it often include viruses.
Don't enable macros unless you know their function.
Don't open any executable files (.exe) that were attached in an email, it poses high threat.