neither Site Import 1.1.3 or Dreamweaver 8 are compatible with Windows 7.
We do not support SiteImport 1 in Windows 7.
I have been able to get Site Import3 working in Windows 7 using Dreamweaver CS3 and CS4.
Site Import 3 will not work in Dreamweaver 8 however, we no longer offer support for Dreamweaver 8.