Version 8 was a bit unstable upon release anyway. Have you downloaded the patch for it?
Meantime, can you please give us more information? Can you be more specific about the crash? Does it literally cause your computer to shut down and reboot?
At what point does it crash? As soon as you start it, or after you've added media to it? If the latter, what model of camdorder is this video coming from and what format and resolution is it?
What operating system are you using? Have you manually gone to Windows Update and installed the non-critical or optional updates that do not install automatically?
How fast is your processor, how much RAM do you have and how much free, clean, freshly defragmented space is on your hard drive(s)? Remember that even brand new computers are a mess of junk files and defragmentation.