I can't pin down exactly what's causing it but every few days I need to reboot due to a runaway spawner which eats all of my CPU and RAM. I've tried disabling windows error reporting and run 5 or 6 different antivirus/antimalware products. I'm ex-IT so I'm fairly confident the PC is malware free. I've run hijackthis, CCleaner and avast boot time scan. Problem still persists.
2 possibles in the system log are
Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected.
File System Filter 'CFRMD' (Version 6.1, 2012-07-17T06:05:37.000000000Z) failed to attach to volume '\Device\Mup'. The filter returned a non-standard final status of 0xc01c0016. This filter and/or its supporting applications should handle this condition. If this condition persists, contact the vendor.