Virus and spyware definitions update failedIf you get the above error when updating the virus definitions in Microsoft Security Essentials, stop the Background Intelligent Transfer Service and start Automatic Updates. You can start the services from Start --> Run --> services.msc.
Security Essentials could not check for virus and spyware definition updates due to an Internet or network connectivity issue.
Click Help for more information about this problem.
Error code: 0x80070422
Error description: Security Essentials can't start the update service because it's been disabled by the security administrator or as a result of a problem in the registry data.
MSE requires both these services to run, but some users have observed that BITS causes failures when a manual update to the virus definition is made. Start the service back after you have done updating the definitions manually.
You can also download the latest virus definitions from a separate computer and apply them on your computer from Microsoft's Malware Protection Center.