Never – never – give anyone access to your computer unless you know who she is, not just who she says she is. Anyone can call anyone and say anything.

If you get an unsolicited email or call from someone asking you to download an application, or to give someone remote access to your computer, just ignore it. It’s almost certainly a scam.

If you need help with your computer, use a well-recognized vendor, and initiate contact by visiting their website. If possible, use https instead of http to load their site, and check the digital certificate for validity using your browser.

Never give any information to someone calling you unless you personally recognize her. Tell her you’ll visit the website of the organization she says she represents, and will conduct your business using information you obtain there. Then do so.

And remember that the best antimalware program is between your ears, not on your computer.