Hi Albert,
Thank you for posting the question on Microsoft Community Forums.
As per the description, you are unable to install Safari on Windows 7.
Are you trying to install Safari for the first time?
I would suggest you to run the Fixit provided in the article:
Fix problems with programs that can't be installed or uninstalled
http://support.microsoft.com/mats/program_install_and_uninstall/?wa=wsignin1.0
If the issue still persists, I would suggest you to post the question in Safari forums.
https://discussions.apple.com/community/mac_os/safari
Hope this information helps. Do get back to us so that we could help you further.