Hi,
Same issue and same circumstances. In our case it is a 2008 virtual machine running under Hyper-V. Could not find reference to the files in the registry.
I think the two missing files are from the previous version of Hyper-V Integration compo...
We were experiencing the same problem: ML350G5, W2K8EE, Ultrium 960, the HP LSI card, and BE 12.5. Backups failed consistently within 5 minutes. Symantec Enterprise support was completely unhelpful with a bunch of double-talk about StorPort vs. SCS...
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SSE Symantec Endpoint Protection Small Business Edition 12
SSE Symantec Backup Exec 2012
SSE+ Symantec Backup Exec 2012