Problem:
Net Express 3.1 install may fail, and it is unable to reinstall Net Express 3.1 again. The install may then detect that Net Express 3.1 is already installed.
Resolution:
1. Delete following files from Windows directory (e.g. c:\\windows or c:\\winnt): MFUnWeb.exe, MicroFocusNet Express31Uninst.exe, NETX31.dat
2. Delete the Net Express directory
3. Delete "HKEY_CURRENT_USER\\Software\\Micro Focus", "HKEY_LOCAL_MACHINE\\Software\\Micro Focus", and any occurrences of "net express" from Windows Registry
4. Reboot the machine
5. Install Net Express 3.1 again