A. A. Usually a normal user will have this problem, not an Administrator, as the problem is security on files. To cure this problem the security on the %systemroot% needs to be set so the Everyone group has RX access (Read, Execute)
If the shell does not start from any account try the following:
- Logon as Administrator
- Press Ctrl-Alt-Del to start the Security dialog. Click 'Task Manager'
- Select the Applications tab. Click 'New Task'
- Select Browse and move to the %systemroot% directory
- Right click on Explorer.exe and select Properties
- Select the Security tab and click Advanced (if you have SP4 installed)
- Select the Ownership tab
- Take ownership
- You should now be able to start Explorer and fix the permission problem
If the above fails you will need to:
- Reformat the drive and reinstall
- Boot from another installation of NT that does not have this problem
- Install onto another volume that does not have security set
For more information see http://support.microsoft.com/support/kb/articles/q155/5/79.asp