I'm sorry for your problems. I also have a 64 bit system with 8 GB and I also use a lot of the paint feature and I have no stability problems at all. My Vue crashes once every 20 hours of work or so, which I consider acceptable.
I have simplified my system the best I could, by removing Aero and all the fancy Windows graphical stuff. I also removed UAC. I don't have any widgets installed and nothing running in the background that I don't absolutely need. I don't even have a screensaver. It's a machine meant for Vue and it runs Vue like a charm. I've heard of many others who also have no problems... and I've heard of many others who do have problems. In the end, it seems to be a problem of some incompatibility between Vue and the environment (either operating system, drivers, whatever).