Win 98 SE with latest updates from Microsoft.
When Installing NMapWin_1.3.1.exe (after first installing WinPcap_3_0_a4.exe AND nmap-3.00-win32.zip and restarting) I get the following error:
Install Shield:
1155: File c:\nmap_3.00\instmsia.exe Not Found.

Nmap DOS works fine