Maybe you should start shutting down your computer the "right way" ?
Start -> Shut Down -> Shut Down
And don't press the power button when you are still in windows.
I guess that might be a problem although I dont think you're a complete newbie. Could be because of some software/hardware conflicts.
I believe windows creates .log files on your C:\ drive and prints there all the errors and stuff. You might want to check those.
Lastly, you might want to try and search for PC related message boards. You'll get a much wiser answer, IMO.
