In Vista Ultimate x86:
If I start Control Panel / Programs and Features, select one of my apps, and then select "repair", I get a popup from Windows Installer that says:
"The feature you are trying to use is on a network resource that is unavailable.
Click OK to try again, or enter an alternate path to a folder containing the installation package 'tcmd.msi' in the box below."
If I run the installer directly, it displays the "Modify / Repair / Uninstall" dialog and I can select "Repair" and it runs successfully.
Rex Conn
JP Software