Can you give the number and the name of the update, it should be something like (KB000000) ? And the link to the related info URL ?

Thanks. :-[

Microsoft Security Essentials - KB2267621

File size: 10,8 MB

Next informations:
http://go.microsoft.com/fwlink/?LinkId=155239

Help and support:
http://go.microsoft.com/fwlink/?LinkID=151935