on my pc windows defender is turned off and wont restart is this because i have webroot installed, have tried to start it but it just switches off again
Windows 8 detects other AVs in the Action Center and blocks Defender from becoming active. You can create a value of type DWORD named HideActionCenter (under HKLM\Software\WRData\ on 32bit or HKLM\Software\Wow6432Node\WRData\) set to '1' and reboot and it will prevent Webroot from adding into the Action Center to allow Defender to stay active. Hope that helps!