I just got an email claiming that I owed a lot of money to some company - and the invoice was attached in a zip file - be warned - never open or click on any attachment, zip, or link in any email unless you are very certain of where it came from.
This sort of infected attachment trick has been around a while and is now being used to spread some of the worst viruses out there, the ones that encrypt every file on your computer and tell you to pay $300 or so to get them decrypted. Nasty work. And they usually won't decrypt the files even if you pay, as many gullible people have discovered.
So backup your important files to something you can disconnect from your computer, a USB key or external hard drive.
And never open attachments or click links in emails you don't recognize.
