Trouble creating shadow copy

I'm having trouble backing up one of our servers.

I've tried to take a manual shadow copy, but that fails too.

This is the output from the diskshadow:

DISKSHADOW> set context persistent

DISKSHADOW> set verbose on
istent
DISKSHADOW> add volume C:

istent
DISKSHADOW> add volume \\?\Volume{21d0911e-a727-11e2-8124-806e6f6e6963}\

DISKSHADOW> create
me \\?\Volume{21d0911e-a727-11e2-8124-806e6f6e6963}\Excluding writer "Shadow Copy Optimization Writer", because all of its components have been excluded.

* Including writer "Task Scheduler Writer":+ Adding component: \TasksStore

* Including writer "VSS Metadata Store Writer":+ Adding component: \WriterMetadataStore

* Including writer "Performance Counters Writer":+ Adding component: \PerformanceCounters

* Including writer "SqlServerWriter":+ Adding component: \ASTAREG-APP01\ASTAREG\master
--removed several lines to keep it readable. (approx 1400 lines)+ Adding component: \ASTAREG-APP01\ASTAREG\unit_450

* Including writer "System Writer":+ Adding component: \System Files

* Including writer "ASR Writer":+ Adding component: \ASR\ASR+ Adding component: \Volumes\Volume{21d0911e-a727-11e2-8124-806e6f6e6963}+ Adding component: \Volumes\Volume{21d0911f-a727-11e2-8124-806e6f6e6963}+ Adding component: \Disks\harddisk0+ Adding component: \BCD\BCD

* Including writer "Registry Writer":+ Adding component: \Registry

* Including writer "COM+ REGDB Writer":+ Adding component: \COM+ REGDB

* Including writer "WMI Writer":+ Adding component: \WMI

The last operation failed.
	- Returned HRESULT: 80042302
	- Error text: VSS_E_UNEXPECTED

Output from vssadmin list writers:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\administrator.LOCAL>vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2005 Microsoft Corp.

Waiting for responses.
These may be delayed if a shadow copy is being prepared.

Writer name: 'Task Scheduler Writer'
   Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
   Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
   State: [1] Stable
   Last error: No error

Writer name: 'VSS Metadata Store Writer'
   Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
   Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
   State: [1] Stable
   Last error: No error

Writer name: 'Performance Counters Writer'
   Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
   Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
   State: [1] Stable
   Last error: No error

Writer name: 'SqlServerWriter'
   Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}
   Writer Instance Id: {1642a445-03f7-47aa-8c2a-026970ffe2a5}
   State: [11] Failed
   Last error: Retryable error

Writer name: 'System Writer'
   Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
   Writer Instance Id: {c7f14ce1-862d-469c-a0f6-4d04f40a6154}
   State: [1] Stable
   Last error: No error

Writer name: 'ASR Writer'
   Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
   Writer Instance Id: {8b7f6ee8-caec-426f-9bb8-a4604676be94}
   State: [1] Stable
   Last error: No error

Writer name: 'WMI Writer'
   Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
   Writer Instance Id: {31e7e45c-a2d2-444a-9658-08f51e1223c5}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'Registry Writer'
   Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
   Writer Instance Id: {03f58120-3f0f-4388-8d79-b18780dac432}
   State: [1] Stable
   Last error: No error

Writer name: 'Shadow Copy Optimization Writer'
   Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
   Writer Instance Id: {33d15e4b-bf9e-4fd5-a85c-491b55cda09e}
   State: [1] Stable
   Last error: No error

Writer name: 'COM+ REGDB Writer'
   Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
   Writer Instance Id: {b048fc99-96a3-4c76-8077-a5e85f34c768}
   State: [1] Stable
   Last error: No error