This is control by policies. You can undo this by grabbing a Windows 98 CD (full version)
To install System Policy Editor
1. In Control Panel, double-click Add/Remove Programs, click the Windows Setup tab, and then click Have Disk.
2. In theInstall From Disk dialog box, click Browse and specify the Netadmin\Poledit directory on the Microsoft Windows 98 Resource Kit compact disc.
3. Click OK, and then click OK again in response to the dialog boxes.
4. In the Have Disk dialog box, select the System Policy Editor check box, and then click Install.
If you want to enable group policies support, place Grouppol.dll in the System subdirectory of the Windows directory on each client computer. In addition, you must make some changes to the registry on each computer to use Grouppol.dll.
You can install group policies during Setup using a batch install script or at any time using the Add/Remove Programs option of Control Panel. Once group policies have been enabled, they are no longer displayed as an option in Add/Remove Programs.
To install group policies
1. In Control Panel, double-click Add/Remove Programs, click the Windows Setup tab, and then click System Tools.
2. Select the checkbox for Group Policies, click OK, and then click OK again.
Important System policies are based on the content of the registry and cannot be edited with a text editor. To define and manage system policies, use System Policy Editor and other supporting tools.
hope this is a good starting point.