Microsoft forefront endpoint protection not updating
You can configure Configuration Manager software updates to deliver definition updates to client computers.
This is done by configuring automatic deployment rules.
Working on the assumption you are using Windows 7, go in to control panel and select Programs and Features.
If you have problems installing Endpoint Protection after you remove existing Internet security programs, contact Windows Defender or Endpoint Protection support by submitting a case online (for more information, see How to Submit a Case Online).
When Windows Defender or Endpoint Protection detects a potential threat that's hiding inside a compressed file with a file name extension or within a network share, it tries to deal with the threat by quarantining or removing the threat.