First follow some simple common-sense rules:
1. Don't download files attached to e-mail from strangers OR people you know unless you were expecting a file transfer.
2. Be careful what sites on the Internet you download files from.
3. It's better to be overly cautious than sorry. If you have any reason to be suspicious, don't download a file. If you recognize the sender but are not sure why they are sending you a file, ask them about it!
4. Most important, install anti-virus software on your computer and keep it up to date with the latest virus definitions. Run a complete scan of all your hard drives on a regular basis (this can be scheduled to run automatically after hours). Anti-virus is included with Windows 10 (Defender). If you prefer a 3rd party app it will disable the virus protection included with Windows 10.
IMPORTANT: We don't suggest you order a security suite if you only want virus protection. Windows Defender plus the Windows Firewall and Windows Update enabled should provide all the basic protection you need.
5. Make sure your operating system is updated with the most recent security patches. Windows Update should be running by default, but you can also click on the "Windows Update" icon in the Start menu under "All Programs" or Settings on Windows 10.
6. Install/activate a firewall, especially if you allow port access on any PCs (ex: HQ Manager). If the firewall notifies you that an unknown program is attempting to communicate with your computer, deny it access until you can verify that it is a legitimate communication. Windows Firewall is enabled by default on Windows 7/10.