Any idea how I contact them?

Thanks for your help but that's what I am doing. I execute this command:

BACKUP DATABASE [MOM-43]

TO DISK = N'C:\Documents and Settings\Administrator\Desktop\43.bak'

And get this result:

Processed 6688 pages for...

It all coincides with installing windows updates. My symptoms match those on this forum thread:

http://www.mydatabasesupport.com/forums/ms-sqlserver/145569-ntbackup-breaking-sql-server-2005-differential-backup-chain-again.html

The solution they give it to turn off the SQL Write Service. I've tried that but...

I already have a full successful backup of the database. In the logs I can see is was successful. In SQL Server Management tool I can see the Last Database...