I have this problem since September last year, always the same problem: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M (1000008e) FAULTING_IP: Always: nt!RtlInitUnicodeString+1b PROCESS_NAME: changes: mostly explorer.exe, sometimes firefox.exe, SyncBack.exe It has something to do with hard disk access I think, it always happens during excessive hard disk access, and doesn't depend on one hard disk. I've checked all my drives with surface scan: no errors. Done a full memtest: no errors. The error time pattern is very random. Last 1,5 month it didn't happen and then suddenly it happens 2 days in a row. Maximum I've had was 2 times on a day. I've Included the last 2 minidumps and corresponding analysis with kz.