The Callscape unit only came with software for WIndows 3.1 & Windows 95.
If you wish to use the original software with Windows 98 then you need the Windows 98 patch which can be downloaded from:
http://www.caller-id.co.uk/CSWin98.zipfree of charge.
If you wish to use the Callscape 100 hardware with XP then you will require Wave Callscape XP software:
http://www.caller-id.co.uk/callscape.asp