When my computer hang up completely after using IE 7, as I just have connected my computer to the Internet for the first time, I had to shut it down with the power button. Then on the next startup, the computer get stuck at "loading" screen, and after many shutdowns using the power button, it told me to choose to run windows normally or safe mode, and If I click on any choice it just lock again I have windows xp, 512 ram, and pentium 4. please help