Backup Getting locked

Hello, I do a full backup daily on a user database. I received an error
telling we the backup failed. (Operating system error = 32(The process
cannot access the file because it is being used by another process.)). How
can I tell what process is locking the file?
Don
http://support.microsoft.com/default...287309&sd=tech
http://support.microsoft.com/?id=833167
"Don" <dons100@.ameritech.net> wrote in message
news:wvLyf.20196$or4.18846@.newssvr12.news.prodigy. com...
> Hello, I do a full backup daily on a user database. I received an error
> telling we the backup failed. (Operating system error = 32(The process
> cannot access the file because it is being used by another process.)).
> How
> can I tell what process is locking the file?
>