Windows defender is stuck and wont start- H50-50

windows defender w.app is stuck and wont start, definitions are out of date but
update failed several times, I've tried to reactivate Windows Defender. to no avail:
" Windows Defender is Microsoft’s homegrown antivirus solution, which is enabled by default in Windows 8. (Unless your PC vendor disabled it to activate a bundled AV solution by Norton, McAfee and their ilk, that is—as Lenovo often does." I looked on MS downloads and there isnt any defender
there isnt any also on my pc programs
I have java 32bits version 8 update 45- lenovo H50-50
thanks

Try Windows Defender support for help with that issue: <br />
http://www.microsoft.com/windows/products/winfamily/defender/support.mspx

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