Had the same problem here. Avast continuously tried to setup NG on each reboot, but kept failing. Performed clean uninstall/reinstall, and all is well now!
Update. This is still not fixed.
07.11.2014 20:35:52.799 4604 | error: TypeLib(Un)Register C:\Program Files\AVAST Software\Avast\ng\vbox\VBoxC.dll, error 0x8002801c
07.11.2014 20:35:52.857 4604 | Installing VirtualBox...
07.11.2014 20:35:57.412 4604 | Creating snapshot...
07.11.2014 20:37:03.354 4604 | Volume shadow set: {4834377f-66a3-4fcd-8a2b-32f76db2afb1}
07.11.2014 20:37:03.462 4604 | BCD volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy50
07.11.2014 20:37:03.540 4604 | Windows volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy51
07.11.2014 20:37:03.699 4604 | Creating new hive files...
07.11.2014 20:39:37.909 4604 | Cloning NTFS volumes...
07.11.2014 20:42:35.625 4604 | Creating a new VM machine...
07.11.2014 20:42:38.230 4604 | Starting VM machine to create initial snapshot, it can take a couple of minutes...
07.11.2014 20:50:52.665 4604 | error: PrepareNGSource/HgcmRpcExecuteVirtualProcess failed, error: 0x0000010b
07.11.2014 20:52:20.576 4604 | OK
07.11.2014 20:52:22.105 4604 | New Ng_f3b4e17a-9c57-474d-a3f1-18047d71efc9 machine has been created, uuid: 5f331b0a-6238-473e-8c26-375f0f1b8e0f
07.11.2014 20:52:39.811 4604 | New Ng_c6f2dcd7-da43-4c05-b36c-1c44857db3c2 machine has been created, uuid: a3467bbb-2f88-4213-a9a5-b631e41a9f10
07.11.2014 20:52:40.092 4604 | New Ng_c11906fb-d0bb-429a-a54d-fa2c009a4996 machine has been created, uuid: 0b4a6b80-0871-445a-bcfb-879e3e6b9904
07.11.2014 20:52:40.170 4604 | CmdAvastInstallWrapper done (result: 0x00000000)
07.11.2014 21:21:18.818 5668 | Installing VirtualBox...
07.11.2014 21:21:19.192 5668 | error: RegisterVBoxServices failed, error: 0x0000045b
07.11.2014 21:21:19.208 5668 | CmdAvastRepairWrapper done (result: 0x0000045b)
07.11.2014 21:24:33.962 2712 | Installing VirtualBox...
07.11.2014 21:24:37.113 2712 | Creating snapshot...
07.11.2014 21:25:24.771 2712 | Volume shadow set: {af391a9f-f5ce-49fe-bec1-b09e86cb093f}
07.11.2014 21:25:26.441 2712 | BCD volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy52
07.11.2014 21:25:26.441 2712 | Windows volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy53
07.11.2014 21:25:26.441 2712 | Creating new hive files...
07.11.2014 21:29:17.670 2712 | Cloning NTFS volumes...
07.11.2014 21:35:47.871 2712 | Creating a new VM machine...
07.11.2014 21:35:51.397 2712 | Starting VM machine to create initial snapshot, it can take a couple of minutes...
07.11.2014 21:41:33.210 2712 | error: PrepareNGSource/HgcmRpcExecuteVirtualProcess failed, error: 0x0000010b
07.11.2014 21:42:56.176 2712 | OK
07.11.2014 21:42:56.410 2712 | New Ng_afe47e68-55d2-4f3f-832b-2ecd56f8a161 machine has been created, uuid: 2f08eb47-a0b0-4279-80bc-3eb2b61e0405
07.11.2014 21:42:56.660 2712 | New Ng_7662ecf8-cb3f-4e54-be02-2c99739cefbb machine has been created, uuid: 32f21cd9-e455-497a-86f8-eaeac034e11d
07.11.2014 21:43:24.459 2712 | New Ng_6e2ff836-3809-4c9c-a989-95b878107506 machine has been created, uuid: 493cb004-5568-41e5-9084-0bbee4c6d49a
Update. After several more reboots I'm only seeing normal activity from the NG and virtualbox processes.