New York (CNN Business)Microsoft has ended support for Windows 7. That means it will no longer provide updates or security patches for the 11-year-old operating system, and the hundreds of millions of PCs still using it are vulnerable to attack. One-third of PCs around the world run Windows 7, according to NetMarketShare. So, if you’re one of those people impacted, what can you do? Good news, for starters: You don’t have to throw your computer or laptop out of the window(s). It’s still usable, but it’s less secure. Microsoft is warning users in a special website that they will be at “greater risk for viruses and malware” because it will no longer provide security updates or fixes. Microsoft is killing off support for Windows 7, which is used on a third of PCs globally Microsoft (MSFT) is suggesting you do one of two things: Read More First, upgrade your existing equipment to Windows 10. The $139 version is good enough for most PCs — even some older ones that still run Windows 7. There’s also a Windows 10 Pro version for $199 if you use it for business purposes. To check if your computer will be able to run Windows…