Today I reinstalled Windows 8 on a new SSD and this morning the system crashed directly after installing the latest vewsion of NIS available from the Norton web site. This was after installing all of the myriad of Windows updates. Windows repair could not repair the system to make it boot into Win 8, so I got to re-reinstall Win 8. This time I was smarter and backed up the system before installing NIS. Sure enough, as soon as I installed NIS, the system crashed and was unbootable/repairable. I restored the backup and am running, but I'm not going to repeat this!
The crash message is System Thread Exception Not Handled
I don't know what version of NIS is on your try-it section of the web site, but it's got problems. I'm running Win 8 Pro on core i7 with 9 GB and tons of disk.
-- Geoff