Sony Vaio cant boot up and stays in a black screen

So I been having some troubles whit a sony vaio model PCG-61611L whit windows 7 when I turn on the computer it does the windows star up screen but where the pasword screen is suposed to show it goes black after a few minutes the windows backround apears whit a huge mouse pointer and after a few minutes a window apears saying
Startup repair is checking for system problems
which it has been on for the last day and nothing hapends
please help and thank you if you respond
 
Windows is maybe damaged or there is a problem with the graphics chip. If you are still getting nowhere I suggest you find your Windows 7 install disk and try to repair windows.
 
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