Alright, well I've had a couple of scans over the years and I've had issues with TxStudio Viewer too. I was told by someone I needed a gaming computer.
For an older scan, TX would only launch after I had copied it to the desktop, ran as administrator and disabled my firewall/virus protection. It had been blocked from running. But even once launched, I could only see the CT slices and a 3D mask of my soft tissue (no actual 3D bone).
The next scan was given to me as an iVision application rather than Tx. So much better and no problems with rendering 3d. It was only of my maxilla area though.
And my most recent scan was a TxStudio Viewer application and doesn't open on my laptop AT ALL (not even with steps I mentioned above). So instead, I asked them for the DICOM files as they are the standard for medical imaging and can be imported into a whole heap of other programs. I think surgeons deal with DICOM files anyway.