“Error 0x8007007B The File name, directory name, or volume label syntax is incorrect.”

The Solution

Using the key provided to you (MSDN etc.) you will need to run the following in an elevated command prompt –
if you are new to Windows 8, click Start –> type “cmd” –> right-click on a command prompt and select “Run as administrator” in the bottom of the page:

Next type the following commands:

slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

slmgr.vbs /ato

The first command will update the key.

The second command will activate Windows.

Replace the “XXXX” bits with your Windows 8 Key (you do need to enter the dashes and you don’t need to surround it with double quotes).

Reference

http://social.technet.microsoft.com/Forums/windows/en-US/4615d78e-8322-42d2-ae96-634c1b61c617/error-code-0x8007007b-when-activating-windows-8-ent