no logon screen with black screen and mouse

hello for all, yesterday when i was making log out from my computer, there is no log out screen!! just black screen and mouse cursor, and when i did restart again , no logon screen appears or no any thing in screen , just black screen and mouse cursor too.

I was tried every thing and no difference :
safe mode
startup repair
restore to some point (i dont have a point)
upgrade windows or reinstall it

i think the things maybe was made this poblem are :
i was edited userinit.exe value from registry by deleting the comma from the end of its value.
i used Windows 7 manager to make some clean and fixes some things on computer.


any help please??

Iam a programmer and have alot of projects and i cant access the