SBS 2003 Backups Failing

We have been having issues with our backup on a SBS 2003 server. We are trying to use the windows backup tool, but lately it has been having some issues. The only time a backup will pass successfully is when I manually run a backup. After manually running the backup hat one will fail, but the backup that runs later that night passes. Any help would be greatly appreciated. I can post log files. Here are some of the errors that failing logs are showing.

Thanks in advance!!!
7/15/2009 11:00 PM
-------------------------------
Date: 7/15/2009
Time: 11:00 PM
User: SYSTEM
-------------------------------
 
Backup Runner started.
Launching NTBackup: ntbackup.exe backup "@C:\Program Files\Microsoft Windows Small Business Server\Backup\Small Business Backup Script.bks" /d "SBS Backup created on 7/15/2009 at 11:00 PM" /v:yes /r:no /rs:no /hc:off /m normal /j "Small Business Server Backup Job" /l:s /f "C:\Windows Backups\Backup Files\Small Business Server Backup (02).bkf" /UM
NTBACKUP LOG FILE: C:\Documents and Settings\SBS Backup User\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\backup10.log
=====================<BEGIN NTBACKUP LOG FILE>=====================
Backup Status
Operation: Backup
Active backup destination: File
Media name: "Small Business Server Backup (02).bkf created 7/15/2009 at 11:00 PM"
 
Volume shadow copy creation: Attempt 1.
Backup (via shadow copy) of "C: "
Backup set #1 on media #1
Backup description: "SBS Backup created on 7/15/2009 at 11:00 PM"
Media name: "Small Business Server Backup (02).bkf created 7/15/2009 at 11:00 PM"
 
Backup Type: Normal
 
Backup started on 7/15/2009 at 11:04 PM.
WARNING: Portions of "\Program Files\Microsoft SQL Server\MSSQL$SHAREPOINT\Data\STS_LANGESERVER_1.mdf" cannot be read.  The backed up data is corrupt or incomplete.
This file will not restore correctly.
Warning: Unable to open "C:\Program Files\Microsoft SQL Server\MSSQL$SHAREPOINT\Data\STS_LANGESERVER_1_log.LDF" - skipped. 
Reason: The system cannot find the file specified.
 
 
Warning: Unable to open "C:\Program Files\Microsoft SQL Server\MSSQL$SHAREPOINT\Data\tempdb.mdf" - skipped. 
Reason: The system cannot find the file specified.
 
 
Warning: Unable to open "C:\Program Files\Microsoft SQL Server\MSSQL$SHAREPOINT\Data\templog.ldf" - skipped. 
Reason: The system cannot find the file specified.
 
 
Could not access portions of directory C:\Program Files\Microsoft SQL Server\MSSQL$SHAREPOINT\Data.
You may not have permission to open the file, or the directory may be missing or damaged.
Please contact the owner or administrator.
 
Backup completed on 7/16/2009 at 1:08 AM.
Directories: 3672
Files: 84563
Corrupt: 1
Bytes: 15,770,802,876
Time:  2 hours,  3 minutes, and  48 seconds
Backup of "LANGESERVER\Microsoft Information Store\First Storage Group"
Backup set #2 on media #1
Backup description: "SBS Backup created on 7/15/2009 at 11:00 PM"
Media name: "Small Business Server Backup (02).bkf created 7/15/2009 at 11:00 PM"
 
Backup Type: Normal
 
Backup started on 7/16/2009 at 1:08 AM.
Backup completed on 7/16/2009 at 1:12 AM.
Directories: 4
Files: 7
Bytes: 1,236,313,074
Time:  3 minutes and  56 seconds
Backup (via shadow copy) of "System State"
Backup set #3 on media #1
Backup description: "SBS Backup created on 7/15/2009 at 11:00 PM"
Media name: "Small Business Server Backup (02).bkf created 7/15/2009 at 11:00 PM"
 
Backup Type: Copy
 
Backup started on 7/16/2009 at 1:12 AM.
 
Error: Could not access portions of directory System State\COM+ Class Registration Database.
You may not have permission to open the file, or the directory may be missing or damaged.
Please contact the owner or administrator.
 
 
Error: Could not access portions of directory System State\Registry.
You may not have permission to open the file, or the directory may be missing or damaged.
Please contact the owner or administrator.
 
Backup completed on 7/16/2009 at 1:12 AM.
Directories: 62
Files: 21
Bytes: 35,716,507
Time:  9 seconds
 
----------------------
 
=======================<END NTBACKUP LOG FILE>=====================
NTBackup finished the backup with errors.
 
For more information about failed backups, see the article on troubleshooting your backup at the following Web page: http://go.microsoft.com/fwlink/?LinkId=18414
 
Backup ended at Thursday, July 16, 2009 1:12 AM
Backup Runner finished.

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corcentAsked:
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jesusrulesmeCommented:
Are you backing up the SBS server to itself?  It looks like it lists that it is backing up to the C: drive.  Also, are you logging in as the SBS Backup User when you manually launch the backup or a different user account?  Have you run a chkdsk of the drives in your server recently?
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corcentAuthor Commented:
We are backing up the server to the C:\. I setup the backup using the Backup wizzard build into windows.
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jesusrulesmeCommented:
Is there a reason you are backing up to the server itself?  You do realize that by backing up to itself you eliminate the majority of the benefit of backing up (hardware failure), right?  I just bring this up because I never ever ever back up a system to itself.  Try backing up to a USB hard drive at the least, then run a chkdsk on your server and then post your results.
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corcentAuthor Commented:
I disabled Showdow Copies
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