Install Symantec DLO

Hello,

I have 3 HP Servers:

1. With Windows Server 2008 + Active Directory

2. With Windows Server 2008 + Microsoft Exchange

3. With Windows Server 2008 + Backup Exec 2014 Server

And 15 desktops and laptops with Windows 7.

Where am I supposed to install DLO? I tried to install it in the dedicated Backup Exec Server (3) but I got an error message of domain account or something like that.

Thanks.