Windows 98 password

I can give you only a headstart since I lost the information.
you have to search for a 3th party software that modifies the msgina.dll of microsoft.
I had once but I lost the link.

success

Leopold

Usually users can simply press 'Cancel' at the Windows logon box to bypass the login process and gain access to the local computer. This tweak will logout the user if the authentication fails or the user clicks Cancel.

Like all registry tweaks, this is for advanced users, please do not attempt to try this if you are not confident with the Windows registry and recovering from any subsequent problems.

Firstly, setup your computer for multiple users by using the 'Users' wizard in the Control Panel. Create a new user in addition to any existing users, then restart Windows and login as the new user (this will become your new default account).

While you are logged in open your registry and expand the [HKEY_USERS] key, there should beseveral sub-folders including ".DEFAULT", "Software" and a folder corresponding to the new username you created above.

Open the key listed below (if the 'Run' key does not already exist then create it), and create a new string value named "NoLogon", and set the value to equal "RUNDLL32 shell32,SHExitWindowsEx 0".

Log-off and now when you login using the new username you should gain access to the desktop, but when you press Cancel or enter the wrong password the desktop should partially load, and then the computer should return to the login screen.

Note: If you have problems with this tweak, press F8 while the "Starting Windows 98..." boot-up message is showing, and select Safe Mode. Then open your registry and delete the "NoLogon" key created above.

Note: Once this tweak has been implemented any subsequent users accounts that are created will inherit the 'NoLogon' value and therefore reboot when they login. To avoid this; when you first create a new user, open the key below for the newly created account name (e.g. [HKEY_USERS\jdoe]) and remove the 'NoLogon' value.

Found this at:
registry.winguides.com/display.php/629/

Essentially it involves Starting Password in the Control Panel and then using Poledit.
You also might look into setting a password at the CMOS level to prevent the ordinary user from even starting the machine

Boot to the BIOS -- Press F2 while the computer boots (different manufacturers will have different ways to get to the computer BIOS; most will spell out on the first screen "Press F2 to enter SETUP" or similar wording)... and then look for the password setup and confirmation. Some manufacturers have these settings in the Advanced section.