What are you using for an Audio sound card ?
Random crashes need to be traced in a few ways. Start a new project with no plug ins and begin adding plug ins that you typically use one by one. More often than not its a plug in not playing nice but could also be a hardware conflict, driver conflict or an update (windows or video, exc)
There is no one thing that someone is going to say "oh ya I had a crash... So must be this".
The more info you can leave the better. I would start with the error message you got with the crash (you might find something in event viewer as well).