13:40:56.593 ntoskrnl.exe CLASSPNP.SYS disk.sys ACPI.sys hal.dll >>UNKNOWN [0x86b4ff16]< \Device\Harddisk0\DR0[0x86b85ab8]
13:40:56.609 3 CLASSPNP.SYS[f7656fd7] -> nt!IofCallDriver -> \Device\00000062[0x86b8cf18]
13:40:56.609 5 ACPI.sys[f75cd620] -> nt!IofCallDriver -> \Device\Ide\IdeDeviceP0T0L0-3[0x86bc7940]
13:40:56.609 \Driver\atapi[0x86b8e720] -> IRP_MJ_INTERNAL_DEVICE_CONTROL -> 0x86b4ff16
The problem was a TDL3 bootkit - TDSSKiller or AVP tool or Dr webb will cure that. Selecting the fix or fixmbr with aswMBR could render the system unbootable as aswMBR is not designed to repair these - just report