Windows 7 Crashing Suspected Sound Card Driver

So i've had my computer for about 6 months now and everything is great apart from the fact it crashes at least twice a day.I suspect it to be my Tascam US-800 soundcard driver as it has always given me problems.When i had it installed before it use to crash if i was uploading anything to the internet or even surfing the web!Since downloading a new update that all stopped. However, now if i am watching a movie on my computer or listening to music for about an hour, the sound cuts out. If i try to restart the comp from the start menu nothing happens, no matter how many time i click restart and i have to forcefully restart the comp.Sometimes the screen just blacks out so i cant get to the restart button.I'm pretty sure it's the sound card driver but the only thing that is making me think twice is that when i am producing music on Cubase, which is 90% of the time, everything runs smoothly - not even 1 error.Is there any way to see what is causing these crashes?