Occasionally once it does start, it freezes on the windows loading screen, or shortly after windows starts, and I have to shut it off again.
Also occasionally once it starts, it tells me that windows did not start properly and if I want to start in safe mode, or use last "working" configuration. I always ask it to use last working configuration, and it starts.
Once Windows has been active for about 2 minutes, it never gives any further problems (until it shuts down again!)
Any ideas what's causing this?