System State Failure using Windows Server Backup - error code '2155347997'

Good Day,

We have a SQL Failover Cluster environment with 2 x Win2k8 R2 SP1 servers. We cannot perform a successfulsystem state backup via the Windows Backup Application. The system was patched with updates and worked fine for about a week until this issue had started, so I don't think it is attributed to the updates?

The job starts and completes 1.73mb before it fails.

Log Name:      Application
Source:        Microsoft-Windows-Backup
Date:          5/21/2013 4:27:00 PM
Event ID:      517
Task Category: None
Level:         Error
Keywords:     
User:          SYSTEM
Computer:      ServerName.domain.local
Description:
The backup operation that started at '‎2013‎-‎05‎-‎21T14:26:36.039544600Z' has failed with following error code '2155347997' (The operation ended before completion.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

I have verified :

1. vssadmin writers are in a stable state

2. vssadmin shadowstorage allocation is fine

3. disk capacity is fine

4. Hotfix http://support.microsoft.com/kb/2182466/en-us  identifies exact symptoms, however this is already included in SP1

5. Server has been rebooted

6. Rectified the imagepaths using the script below to identify services with invalid paths

http://blogs.technet.com/b/askcore/archive/2010/06/18/ps-script-for-blog-enumeration-of-the-files-failed.aspx

    6a. However, I am unclear if these imagepaths are anything to be concerned with, as they startup on a       

          cluster storage resource ( SAN drives ). They also do not get fixed unless I point to a C: drive location

PS C:\!!Software!!> .\GetInvalidImagePathsV2.ps1

Following are the service(s) found to be reporting invalid paths.

     Service Name    : QuestLauncher3566
    Service Caption : QAM Launcher 3566
    Registry key    : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\QuestLauncher3566\ImagePath
    Value           : "K:\Program Files\Quest Software\pa_agent\3566\agents\bin\quest_launcher.exe" 3566 "+K:\Program Fi
les\Quest Software\pa_agent\3566\agents"
    Reason          : The service path contains invalid characters. Characters < > : " | ? cannot be used in a file path
.

     Service Name    : QuestLauncher3567
    Service Caption : QAM Launcher 3567
    Registry key    : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\QuestLauncher3567\ImagePath
    Value           : "P:\Program Files\Quest Software\pa_agent\3567\agents\bin\quest_launcher.exe" 3567 "+P:\Program Fi
les\Quest Software\pa_agent\3567\agents"
    Reason          : The service path contains invalid characters. Characters < > : " | ? cannot be used in a file path
.

     Service Name    : QuestLauncher3568
    Service Caption : QAM Launcher 3568
    Registry key    : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\QuestLauncher3568\ImagePath
    Value           : "I:\Program Files\Quest Software\pa_agent\3568\agents\bin\quest_launcher.exe" 3568 "+I:\Program Fi
les\Quest Software\pa_agent\3568\agents"
    Reason          : The service path contains a reparse point. Paths containing a reparse point are not supported.

     Service Name    : QuestLauncher3569
    Service Caption : QAM Launcher 3569
    Registry key    : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\QuestLauncher3569\ImagePath
    Value           : "J:\Program Files\Quest Software\pa_agent\3569\agents\bin\quest_launcher.exe" 3569 "+J:\Program Fi
les\Quest Software\pa_agent\3569\agents"
    Reason          : The service path contains a reparse point. Paths containing a reparse point are not supported.

Does anyone have any other suggestions as there are no specific fixes for Windows 2008 R2 SP1?

Thank you,

Navs M