How to edit registry using recovery console or dos

Question

Hello everybody!
Due to some reason (virus) the value of  - "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon - Shell " was changed so I repaired it with Explorer.exe. But  due to some spelling mistake now I can log in in Win Xp. When the user log in screen appears and I choose the account its automatically logOff and return to the User Log in screen.
Now I have to repair the spelling mistake in registry key.
Please inform How can I do this. I can't log in so I can't use "Regedit". Can it is possible to edit the registry using recovery console?
Thanks & regards
nitin

Answer 1

Step 1
Type "cd %systemroot%/system32/" into the command prompt to go to the folder that contains the Registry Editor.
Step 2
Type "reg" into the command prompt to display a list of parameters and instructions on how to edit the system registry.
Step 3
Type "reg [parameter] /?", replacing "[parameter]" with one of the listed parameters, into the command prompt to list all available functions that can be used with that parameter.
Step 4
Type "reg [parameter] [function]" into the command line, but replace "[parameter]" with one of the listed parameters (query, add, delete, copy, etc.) and "[function]" with a function listed above, along with any additional options
for each function. For example, to delete a registry key, type "reg delete [rootkey]\[keyname]", replacing the "[rootkey]\[keyname]" text with the location of the registry key.
Step 5
Save a registry key by typing "reg save [rootkey]\[keyname] [filename].hiv", where the "[rootkey]" and "[keyname]" text are the location and name of the registry file and "[filename]" is the name of the file to which
you are saving the key.
Step 6
Restore a registry key by typing "reg restore [rootkey]\[keyname] [filename].hiv", where the "[rootkey]" and "[keyname]" text are the location and key name that you want to restore and "[filename]" is the name of the
file containing the saved key.
Step 7
Import a "REG" file by typing "reg import [filename].reg". To export a registry key to a "REG" file, type "reg export [rootkey]\[keyname] [filename].hiv", where the "[rootkey]" and "[keyname]" text
are the location and key name that you want to export and "[filename]" is the name of the "REG" file you are exporting.