I am having trouble getting my enterprise build 10061 to activate. Normally, up to this point, when I had a new build installed, I would have to re-enter the enterprise preview product key, and activation worked. Now, after updating to build 10061, I see an error on the activate Windows screen:
Error code: 0x8007007B Error description: The filename, directory name, or volume label syntax is incorrect.
If I try to manually enter the product key to activate, I get this message: