Toshiba Satellite L745 shutdown when in Hard drive disk recovery

my Toshiba Satellite L745 (windows 7 x86 dual core) suddenly shutdown when in HDD or Hard drive disk recovery , now everytime i open it ,it says that "windows is loading files . . ." then after that it suddenly goes in a black screen with a white cursor .
Please help me with my problems ..

EDIT:
when i try pressing f8 it says that "there are no bootable disk .Please insert a disk a press any key"
Should i put the repair disk or the installation disk. http://imageshack.us/photo/my-images/580/20120818154525.jpg/ here's an image captured by my phone hope this image help you to solved my problem
Sorry for putting up the link , i cannot upload it using the attachments
thank you for your consideration

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