SQL 2005 Maintenance Backup Plan fails

I recently created a maintenance plan on a SQL 2005 database.  The plan runs nightly, and it will work without errors for 2-3 days.  Then I will get an error like this
Executing the query "declare @backupSetId as int
select @backupSetId = position from msdb..backupset where database_name=N'TRACKIT80_ISDATA' and backup_set_id=(select max(backup_set_id) from msdb..backupset where database_name=N'TRACKIT80_ISDATA' )
if @backupSetId is null begin raiserror(N'Verify failed. Backup information for database ''TRACKIT80_ISDATA'' not found.', 16, 1) end
" failed with the following error: "Cannot open backup device 'D:\\SQL Backups\\TRACKIT80_ISDATA\\TRACKIT80_ISDATA_backup_200710170200.bak'. Operating system error 32(The process cannot access the file because it is being used by another process.).
VERIFY DATABASE is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.

and this error number:  -1073548784

Any suggestions?
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Chris MangusDatabase AdministratorCommented:
The double backslashes look very suspicious.  When the backup job runs successfully what does the job log and the SQL log show?  Do either of them show double backslashes?

Also, do you have anything else running at the same time as your backup job like diskeeper or is anything trying to back up the .bak file at the same time?

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Microsoft SQL Server 2005

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