In particular I am speaking of ArcGIS 9.2. It was originally installed from a network location on to the workstation. We wanted to modify the installation to add .NET support. Usually this is done by Add/Remove programs in control panel or running the installer. When we did the Add/Remove programs and then chose .NET support, [...]

ArcGIS Server 9.2 and ArcGIS Server 9.3. When you use Internet Explorer 7 we noticed that many users on the ESRI forums were having this issue. The issue is that when you launch the server manager which typically loads in Internet Explorer, you receive the following.
“Object Reference not set to an instance of an object. [...]