Interactive logon process initialization failure

1. Have you made any recent changes on the computer?

2. Do you have any security software installed on the computer?



Method 1

Check if the issue persists in the safe mode.

Start your computer in safe mode

http://windows.microsoft.com/en-US/windows-vista/Start-...

Restart the computer to get back to the normal mode



Method 2

If you are able to boot into Windows in the safe then try the clean boot procedure and check if it works.

To help troubleshoot error messages and other issues, you can start Windows Vista by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.

Refer the below link to know more about clean boot procedure.

How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

http://support.microsoft.com/kb/929135

Reset the computer to start as usual

After you have finished troubleshooting, follow these steps to reset the computer to start as usual:

a) Click Start, type msconfig in the Start Search box, and then press ENTER.

b) If you are prompted for an administrator password or for confirmation, type your password, or click Continue.

c) On the General tab, click the Normal Startup option, and then click OK.

d) When you are prompted to restart the computer, click Restart.



Hope this helps!