During the migration of one of our Symantec Enterprise Vault Archive server for exchange to new Storage,

default windows drives shares (C$, D$, etc.) got lost & because of this application stopped working.

 The solution that worked for us was  to modify the value of

autoshareserver key to 1 that has changed to 0. The Key is present in the below registry location.

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters