I have a nextbook nxw9qc132b that i forgot password for sign in screen.

To view your password you need to open up a command prompt (cmd.exe)

Than type in netsh wlan show profile and press enter. This command will show all of the access point you have connected to in the past

Now type in netsh wlan show profile "your access point SSID without the quote" key=clear and press Enter

example if my SSID is ABCD than I would type it like this

netsh wlan show profile ABCD key=clear

It will show you the password of your access point.

try this link might help you out.
factory restart nextbook Google Search
or this.
How do you hard reset Nextbook device

have you looked here forgot my nextbook password how do reset it Model Next7pi forgot my...

use it as an anchor

View this video for hard reset:

Nextbook Android Quad Core Tablet 8
Nextbook Android Quad Core Tablet 8

Get it wrong a couple of time and then it will say forgot pattern and click on that

how can I get to the reset password page I can't get passed login

If you're willing to reset to factory defaults, then there is a way to fix this. However, the reset will delete all data and any apps installed that didn't come with the Nextbook Tablet originally.