When i start my computer it boots and after a while when it says starting windows after that then the screen becomes black but the computer is still on? NOTE! Ive just installed windows 7 so i cant boot in safe mode! When i select safe mode and presses enter it says preparing windows for first use and then it says cant continue the installation in safe mode! Please restart to continue installation? PLEASE HELP ME! I got nvidia geforce 9500 intel quad core 8200s 2.33 Hp comp Ctrl alt delete doesnt work! ive tried to reinstall windows 7 doesnt work!