1. Register the msxml3.dll file

• Click Start > Run.
  
• In the Run dialog box, type the following text : regsvr32 %windir%\system32\msxml3.dll
  
• Click OK.

2. Perform one of the following depending on the message that is seen:       

• If the message is "DllRegisterServer in C:\Windows\system32\msxml3.dll succeeded" go to Step 4. 

• If the message is "LoadLibrary("C:\Windows\system32\msxml3.dll") failed..." go to Step 3.  

3. Check if user (Backup Exec System Account [BESA] and Windows user used to log into the media server) has full permissions on C:\ drive. 

• Go to My Computer > Right Click on C: drive > Properties > Security.
  
• Check which user account is used to log into the Media Server and confirm if it has full permissions (Read, Write, Modify) on the C:\ drive.  
  
• Check if BESA does have full permissions (Read, Write, Modify) on the C:\ drive. (Figure 1)

 Figure 1:

• From the Security tab click on Advanced button > Permissions. 
  
• Make sure there is no DENY policy/rule at the top in the list because Deny policy always superesedes Allow policy.  

4. Reinstall MSXML 3.0 

• To download and install MSXML 3.0, read the Microsoft document.Microsoft XML Parser (MSXML) 3.0 Service Pack 7 (SP7) :   
  http://www.microsoft.com/download/en/confirmation.aspx?id=4608  

5. Login as Local Administrator Account. 

6. Run LiveUpdate 

• In the Backup Exec User Interface, go to Tools  
  
• Click on LiveUpdate.   

Note: If issue still persists please contact Symantec Technical Support.