Every now and then the AV will block the built in back up software in Vista ultimate. The error that backup reports is:
Log Name: Application
Source: Windows Backup
Date: 6/7/2009 8:42:59 PM
Event ID: 4104
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: PC
Description:
File backup failed. The error is: Access is denied. (0x80070005).
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Windows Backup" />
<EventID Qualifiers="0">4104</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-06-08T00:42:59.000Z" />
<EventRecordID>21702</EventRecordID>
<Channel>Application</Channel>
<Computer>PC</Computer>
<Security />
</System>
<EventData>
<Data>Access is denied. (0x80070005)</Data>
<Binary>05000780E0040000F10600000D070000420ED1665C2BEE174B64529CB14610EA71000000</Binary>
</EventData>
</Event>
Once I disable the AV, I can click retry and the back up finishes just fine.