Bootup stalls at wallpaper-need to use Task Manager new task to get to desktop.

Upon boot up into Windows 7 Ultimate recently, suddenly Windows Explorer Library popped onto the desktop. I tried to search various forums for a solution in regedit but now find I can boot up to wallpaper where it hangs up. I am able to go to Windows Task Manager>New Task and type "C:WINDOWS/system32/userinit.exe" (without quotes) and the desktop boots. I don't know if I did something wrong in the registry editor. Is there a fix for this problem?

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