That command I gave you is wrong. sorry.
See below for the correct way to do it
On Windows 2003, ASP.NET must be both installed and enabled. To install ASP.NET:
On the taskbar, click the Start button, point to Control Panel, and then click Add or Remove Programs.
In the Add or Remove Programs dialog box, click Add/Remove Windows Components.
In the Components box in the Windows Components Wizard, click the Web Application Server check box, and then click Next.
When the Windows Components Wizard has finished configuring Windows Server 2003, click Finish.
To enable ASP.NET, run this command from the Start>Run box or a command prompt (assuming the system directory is C:Windows):
.Net 1.1: C:WindowsMicrosoft.NETFrameworkv1.1.4322aspnet_regiis.exe -i -enable