This post may be a little long but refers to a very serious problem I have encountered. System: Windows Vista 32 bit Nod 32 v4 fully licensed. Recently tried to open a Microsoft Word Document and got message that the file might be infected with a virus and would not open. At the very same time the Nod32 Icon in the system tray turned red. Clicking on the red icon revealed that the update option was grayed out and disabled. Double clicking opened the normal window with the message that the license had expired. In addition, the link to upgrade to the full version did not work. To be clear, my license has NOT expired. I tried a scan with another online product (safety.live.com) and during that scan the icon turned green again and all seemed OK. I could even now open the Word documents. A scan then with Nod32 came out clean. Now, two days later, the same thing has happened. I can find no reference to this problem anywhere else and hope forum members can help. Thanks in advance.