Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2 may stop responding at the Welcome screen after you enter the user credentials to log on to the computer
After you enter the user credentials to log on to your computer, the operating system may stop responding at the Welcome screen. This issue may occur on a computer that is running one of the following operating systems:
- Windows Vista
- Windows Server 2008
- Windows 7
- Windows Server 2008 R2
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2526870.