You have this problem:


For ArcGIS 9.1 need next steps.

Install .NET support for ArcGIS9x

For correct installation of .NET support, you should have local administrative privileges.
If you installed the Microsoft .Net Framework v1.1 prior to installing ArcGIS 9.0 then the ESRI Net support will have been automatically installed.
If the Net Framework v1.1 was installed after ArcGIS 9.0 then the following steps have be made to install the ESRI Net support. You can also follow the steps below to validate installation of the ESRI Net support.

1) Install Microsoft Framework 1.1
2) Display the Add or Remove Programs dialog from the Windows Control Panel (see How to Uninstall above for details),
3) Select ArcGIS Desktop from the list of installed programs
4) Click the Change button to launch the installer. (at this point you may be asked for the source media or access to a network folder that was used to install ArcGIS Desktop)
5) Select Modify and then click Next >. The following dialog will appear listing all the current installed components of ArcGIS 9.
6) Click on .NET Support and select "Will be installed on local hard"
7) Click Next>
8) At the confirmation prompt click Next > again.
9) As the new files are installed the following progress dialog will appear. If necessary, the installation can be cancelled by clicking the Cancel button, but this is strongly not recommended.
10) Finally click Finish from the installation wizard



For ArcGIS9.0 need download KMLer
http://bbs.keyhole.com/ubb/download.php?Number=595581

For ArcGIS 9.2 need inext steps (thanks to Jayme Laber):
"After some research on the ESRI web site I found the solution. When running ArcView 9.2 you need to install Microsoft Net 2.0 rather than Microsoft Net 1.1. Once I installed Net version 2, I was able to continue through the instructions and was able to complete steps 2 - 10 with no problems. I would suggest a post to your support page that alerts your users to this situation and its solution. "
http://gis.esri.com/library/userconf/devsummit06/papers/windowsapp_net.pdf
http://www.microsoft.com/downloads/detai...;displaylang=en