Cant Startup My Computer!

whenevr i start my computer it goes to a black screen that gives me 2 options:

1. fix start-up problams (recommended) -or something like that

2. start windows normally

whenever i choose the 1st option it waits 2 seconds and then goes back to that black screen the secont option- it starts loading windows for a long time (about a minut, a minut and a half) and then it gives me a blue screen that says something about problems (i cant read it, becouys it disappears 2 fast-there are percents running down...) and than goes back 2 tha black screen. i pressed some buttons and then it gave me some options , i chose 2 start windows in a safe mode, but -again!!!!-that damn black SCREEN

again, i pressed some buttons and it gave me the same optionsa and i chose to boot windows in a way that it would give me the last document it faild 2 open or something like that (that's what the description said, anyway...). it gave me another blue screen (after he tried starting windows) that gave me some kinda data path and the said: partitons: 2 and then something in '[ ]' and lower it said: enter=submit. esc=cancel. silly of me, i know, but i pressed enter, and it brought me to a blue screen that said: *** STOP: 0X0000005C ( 0X0000010B,0X00000003, 0X00000000, 0X00000000). i run a searc in google and all the people who had this problem said they first tried 2 install a new windows- but i didnt!!! the computer worked just fine, and then it fell from a height of about 4 feet, but it kept working until my sister closed it and the opened again.