You actually need more answers than you asking for. . . . That is to say you should start with the Admin Guide: Acrobat-Reader Enterprise Toolkit Home.
You probably need a volume license. Read up on the server doc, look up the right EULA for virtualized environments, and read the section on granting offline exceptions/serialization/installation. Check out the Wizard Guide as well.
Error 1 doesn't sound like an Acrobat error, but it could be. Make sure you have a clean uninstall before retrying. There's a cleaner tool on LABs.
32 Bit is ok.
Ben
Question 1: Do I need a 64-bit version of Acrobat Pro?
Question 2: Will a desktop license suffice on a server?
Question 3: I have 7 servers that require this installation, do I need a different key for each?
Question 4: Do I really need to license each one via the internet?