Hello,
How many drives does the autoloader contain? Ensure that you are using the latest revision for 10.0 that is 10.0 5520. If not, install it from the following link:
VERITAS Backup Exec (tm) 10.0 rev. 5520 for Windows Servers Installation Files
http://support.veritas.com/docs/277181
Also install the latest drivers for 10.0 5520 from:
http://support.veritas.com/docs/278408
Also run an Inventory and test the results. If the issue persists, revert with details.
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Regards.