Black Screen with Cursor on startup, but Windows works

[Kergal]

Whenever I boot Windows 7, after it starts, instead of showing the login screen, it show a black screen with a movable cursor. Now, I can go into safe mode, and it works, but, hell, I can even put my password on that black screen, press enter and it will go into Windows and work just fine. But the thing is, it's supposed to show the login screen, not just a black one, so I'm a bit worried of what might be causing the problem, and whether or not it could expand into something worse. Any help would be appreciated.

 

[seaways911]

hi kergal
press and hold f8 the power up the laptop then select repair ur computer select command prompt and write
chkdsk then write chkdsk /c
the exit
and make restart

 

[Kergal]

Well, I have already done that, and Windows found no errors on the drive. Antivirus doesn't find anything either. By the way, it's not a laptop, it's a desktop computer.