Apple MacBook

I am now using an Apple MacBook white, 2.16 GHz, 1GB RAM, and 120GB HDD. I have several complaints about this product, but maybe this is my own mistake (?). I used BootCamp in Mac OS X, so i can use Windows also. But the Windows show some "complaint-able" things.

1. Sometimes the contrast gets darker, then lighter, then dark again, and so on. It continues for 3-4 seconds. I find it very annoying, because my eyes aren't good anymore, and they are very sensitive to things like that.
   
2. If in case my laptop turned to Sleep mode when it is in Windows mode, it is really erroneous when turned back on. It can't be shut down, and some errors show up themselves, like "Network Cable 2 has been unplugged" (i don't use any network cables...) or "Application failed to initialize, because rxgvrw.dll is not found" (the rxgvrw is not real, i forgot the letter sequence, and i don't want to try again

I am quite disappointed. Can somebody tell me the solution to these things?