In the list of results, swipe down on or right-click Command Prompt, and then tap or click Run as administrator. In the Administrator: Command Prompt window, type the following command and press Enter: sfc /scannow. When the system scan is complete, try to install Office again.
when i open windows security it says that the virus data base is up to date but when i click on update it comes back with message saying "virus and spyware definition can not be updated.
To make matter worse, the status of the virus and spyware definitions is always up to date despite no update been done until after 7 days, where MSE will only consider the computer with seven-day-old signatures to be at risk.
If the conditions are true, MSE will grab new update from Microsoft Antimalware server automatically.
For some PCs which regularly go into sleep mode, standby, or hibernation, and miss the scheduled update check, Microsoft Security Essentials fails to play catch-up to update the definitions database when the computer wakes up or back online.
The signatures were two days old when I updated it manually.
My user account is a limited one, running surun if that might matter.
Microsoft Security Essentials (MSE) is a free anti-virus, anti-spyware and anti-malware program from Microsoft, which is now probably one of the most popular free antivirus security software for PC.
MSE is available as free download for genuine Windows users as alternative to pricey premium security solution.
We currently have MSE installed on the Windows 7 machines in our environment.
The Security Center widget on the Spiceworks dashboard shows the clients, but there are numerous versions being detected (anywhere from 2.1.1116.0 through 126.96.36.199).
However, sometimes Microsoft Security Essentials can fail to update its virus and spyware definitions signature database.
Actually, the main problem is that Microsoft Security Essentials does not update the virus and spyware definitions according to schedule.
The failure to update virus and spyware definitions problem arose from the fact that MSE is set to check for updates once every 24 hours by default.