Hello everyone, here is a root method for the Nextbook Premium 7 that comes stock with Android 4.0.
This does NOT use a custom rom, or custom Recovery.
First, you need to install MoboRobo, because it installs a ADB driver for our Nextbook.
Then, download this zip folder. It contains a root method for Android 4.0
Then, extract it.
Now, the batch file has some errors in it, so I edited it and added in some needed points. AKA it was missing some bits where it needed a echo command in the batch telling you what to do. Here's the link. It's on my website so it can't get deleted as DropBox files with lots of activity get locked.
Copy the edited batch folder into the already extracted folder for ICS Root Unlocker. Then run, while folowing the instructions.

PSLover14