I found an NG log located in Program Data -> avast, but it doesn't state that the vm has fully started it's been stuck at the last line for over 20 minutes now.
22.09.2014 09:03:38.040 | Installing VirtualBox...
22.09.2014 09:03:39.476 | Creating snapshot...
22.09.2014 09:04:27.963 | Volume shadow set: {f2ffdeaa-c8a9-49ba-b220-ee3f1174fb37}
22.09.2014 09:04:27.963 | BCD volume: \\?\GLOBALROOT\Device\HarddiskVolume2
22.09.2014 09:04:27.963 | Windows volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy4
22.09.2014 09:04:27.963 | Creating new hive files...
22.09.2014 09:06:34.187 | Cloning NTFS volumes...
22.09.2014 09:11:11.068 | Cloning NTFS volumes...
22.09.2014 09:11:38.092 | error: InsertFile/dep_fsGetFileIdW failed, guest folder: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy4\WINDOWS\System32\config (error: 0x00000003)
error: InsertFile/dep_fsGetFileIdW failed, guest folder: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy4\WINDOWS\System32\config (error: 0x00000003)
error: InsertFile/dep_fsGetFileIdW failed, guest folder: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy4\WINDOWS\System32\config (error: 0x00000003)
error: InsertFile/dep_fsGetFileIdW failed, guest folder: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy4\WINDOWS\System32\config (error: 0x00000003)
error: InsertFile/dep_fsGetFileIdW failed, guest folder: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy4\Program Files (x86)\Google\Chrome\Application (error: 0x00000003)
22.09.2014 09:11:38.092 | 22.09.2014 09:11:38.092 | Creating a new VM machine...
22.09.2014 09:11:43.858 | Starting VM machine to create initial snapshot, it can take a couple of minutes...
22.09.2014 09:36:51.501 | error: PrepareNGSource failed, error: 0x800705b4
22.09.2014 09:36:51.504 | CmdAvastRepairWrapper done (result: 0x00000000)
22.09.2014 09:36:59.888 | Installing VirtualBox...
22.09.2014 09:37:01.420 | Creating snapshot...
22.09.2014 09:37:22.923 | Volume shadow set: {10272bf0-408d-4654-adf1-577c1143a6bb}
22.09.2014 09:37:22.924 | BCD volume: \\?\GLOBALROOT\Device\HarddiskVolume2
22.09.2014 09:37:22.924 | Windows volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy5
22.09.2014 09:37:22.925 | Creating new hive files...
22.09.2014 09:39:43.966 | Cloning NTFS volumes...
22.09.2014 09:40:42.565 | 22.09.2014 09:40:42.565 | 22.09.2014 09:40:42.571 | Creating a new VM machine...
22.09.2014 09:40:43.588 | Starting VM machine to create initial snapshot, it can take a couple of minutes...
22.09.2014 10:03:49.905 | Starting VM machine to create initial snapshot, it can take a couple of minutes...
22.09.2014 10:29:00.301 | error: PrepareNGSource failed, error: 0x800705b4
22.09.2014 10:29:00.303 | CmdAvastRepairWrapper done (result: 0x00000000)
22.09.2014 10:29:37.211 | Installing VirtualBox...
22.09.2014 10:29:38.510 | Creating snapshot...
22.09.2014 10:29:58.000 | Volume shadow set: {b50d06b3-6699-4795-8197-005303b908c3}
22.09.2014 10:29:58.001 | BCD volume: \\?\GLOBALROOT\Device\HarddiskVolume2
22.09.2014 10:29:58.001 | Windows volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy6
22.09.2014 10:29:58.002 | Creating new hive files...
22.09.2014 10:32:02.910 | Cloning NTFS volumes...
22.09.2014 10:33:04.392 | 22.09.2014 10:33:04.393 | 22.09.2014 10:33:04.398 | Creating a new VM machine...
22.09.2014 10:33:05.497 | Starting VM machine to create initial snapshot, it can take a couple of minutes...