Black Screen On Startup

well, for the last couple of weeks during shutting down the laptop, it showed a screen showing "explorer.exe could not terminate. press ok to stop the program". well, last night i decided to close the process explorer.exe from the task manager. i am a bit novice in these technical stuff. after that, only the wall paper appeared on the screen with no icons or taskbars or anything. not knowing what to do, i decided to force shut down by long pressing the power button. since then, whenever i wish to turn on the laptop, it doesnt do so. the screen stays black with absolutely nothing on it. the power light is on, the caps lock, num lock, scroll lock lights are on but tapping them doesnt turn the lights off. the fan spins as evident from the sound and the cd in the dvd drive rotates too with no effect. i have tried with win z home boot cd, win xp boot cd but nothing happened.  any help will be highly appreciated. looking forward to some since am in a real fix. pls help. ps: i dont know whether these are relevant data or not but when the laptop is idle, then also some 150 processes seem to run in the task manager. a few days back, the audio driver was uninstalled all on its own. internet explorer crasehes every other day.