NBRT "Scan failed" error

Hi,

 

Been having some odd issues with my system (Windows Explorer crashing, very slow and/or non-responsive windows, etc), normal NIS full system scan found nothing, so downloaded NBRT, created a USB stick with it, changed my BIOS settings, and booted into NBRT to run a scan.

 

When I tried running the scan it simply came back with the error "Scan failed" and no other information.

 

I'm running Win 8.1, on a Lenovo U410.

The HDD drive is visible within NBRT (if I go to the command prompt I can change to and dir both the C: and D: partitions).

 

What could be causing this problem, and how do I get NBRT to run correctly?