Try running Control Panel > Windows Update, and do a manual scan. Are the
Defender definition updates offered? Do they install? Is there an error
code?
If that doesn't work, try here:
http://www.microsoft.com/security/portal/
Under "Latest Definition Updates", choose your operating system type, 32-bit
or 64-bit, and try the manual download. Note here the instructions
pertinent to Vista:
http://www.microsoft.com/security/portal/ADL.aspx#top
"Diana" <Diana @discussions.microsoft.com> wrote in message
news:F5D2663E-F982-418E-A2C8-6E4B9D99589E@microsoft.com...
> Hi,
> Ever since yesterday, Windows Defender says it needs to update and when I
> let it update it says there was an error and it was unable to update the
> definitions and gives me error code 0x80072efd. I tried to fix it with the
> recommendations that I found for XP but I guess its not the same. Can
> anyone
> tell me how I can fix it?
> Thanks