Toshiba Satellite L500D black screen with mouse cursor

Hello,

I have just bought this laptop from my uncle. It's around 5 months old and one day when I try to press the power button it shows up a message says
"Windows cannot start due to the recent incorrect changes to software/hardware"
and below it there are two options:
Start system repair (Recommended)
Launch windows normally
If I choose the second option, it would take ages on the starting windows screen and later turn to a black screen with white mouse cursor.
For the first option I inserted the recovery disk, a loading files message start up and then switch TO THE BLACK SCREEN WITH MOUSE CURSOR.
I really need my laptop and have tried to look through all the websites for help but they don't really seem to work :(
Some options that I tried:
- press F8 and chose all the three different safe mode options ( computer loaded the system files and then after a while blue screen flashes and it restarted and show me the same msg as above)
- press shift 5 times but nothing comes up, not even the sound.
-Crt + Alt + Del for task manager but nothing comes up either
-Reset everything in the F2 thingy to default.
-Launch a boot by recovery DVD / CD ( ONE time I got lucky and have the screen with colour and allow me to choose the language, I chose english and nothing comes up after that.)
- Hold the "0" button when starting up but still doesn't work ( I got this from youtube)
Hope you guys can help!! Thanks.

It has Windows 7 BTW