I have a few windows servers that I am getting the following error on for backups (finished with exception)

2013-05-13 19:10:04 avtar Error <5139>: File access share error "\\?\volume{f1f1c4e9-9d3d-11e2-93e8-806e6f6e6963}\Boot\BCD" (code 32: The process cannot access the file because it is being used by another process). (Log #2)

I am unable to find out just what this is and if it is important or if it can be exclude (and if it can HOW to format the exclude)

So any windows admins out there know what this is?