You may receive the above error when installing NFuse 1.61 onto a MetaFrame XP FR1 server.
During the installation of NFuse 1.61, Setup attempts to modify the contents of the PNAgent folder beneath your Web server's document root directory (InetPubwwwrootPNAgent). If your Web server is also a MetaFrame XP server with Feature Release 1, the PNAgent folder may already exist and be in use, preventing the NFuse 1.61 installer from completing. The error message you receive during installation is:
"The installation exited prematurely due to an error.”
To resolve this issue, rename the InetPubwwwrootPNAgent folder to PNAgent.bak before running the NFuse 1.61 installation program. If you made modifications to your PNAgent files, copy them from PNAgent.bak to the newly created PNAgent folder when NFuse 1.61 installation is complete.