It will tell you if you have 32bit Windows or 64bit Windows. Here's the page you need to read and from which you can manually download the latest spyware and antivirus definitions for Microsoft Security Essentials. One note. There's a mistake on the page. At the top it says Windows XP, Windows Vista, and Windows 7. I'm running a 64bit version of Windows 7 on a computer that's a few years old. I recently installed malwarebytes, and found a few trojans and a good bit of adware. Aside from that, my computer is very clean. I quarantined the viruses, but just now my computer has been acting absurdly laggy Security Essentials Troubleshooting Tips, Help & How-To's | Microsoft Security Essentials: BTW, there is a separate forum dedicated to Microsoft Security Essentials. Download Microsoft Security Essentials Update - Provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software. .

microsoft security essentials won t update