See this KB article which has many suggestions & tips:
How to troubleshoot definition update issues for Windows Defender Beta2:
http://support.microsoft.com/?kbid=918355
An update is available for Windows Defender Beta2 that resolves this issue
for most users. See the Defender newsgroups.
Microsoft has established separate newsgroups for Windows Defender Beta2
support and comments. This is not one of them.
See
http://www.microsoft.com/athome/secu...s/default.mspx
--
~Robear Dyer (PA Bear)
MS MVP-Windows (IE/OE, Shell/User, Security), Aumha.org VSOP, DTS-L.org
Dagger wrote:
> these 2 defender updates failed to install 1.14.1511.3 & 1.14.1501.7.
> Only 1 offers the option on reinstalling but don't know how to do that