I have read a bunch of discussions in which the "correct" answer is "can not be activated", "will not run on Win 7", "was never free" and other incorrect answers. To dismiss these incorrect "correct" answers, I have provided the following links. If you use any of the links, I would appreciate you leaving a response and marking this question and your response as it "helpful"
System Requirements: ftp://ftp.crim.ca/pub/sinf/v7%20standard/ReadMe.htm
Limitations on x64 systems: http://www.adobe.com/support/techdocs/331732.html
Acrobat 7 and Windows 7 : http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_programs/can-i-use-adob e-acrobat-70-on-win7/b73fd3f0-947c-46f3-be86-c55e5ea71ea1
Acrobat 7 and Windows Compatibility : http://www.microsoft.com/en-us/windows/compatibility/CompatCenter/ProductDetailsViewer?Nam e=Adobe%20Acrobat&vendor=Adobe&ModelOrVersion=7&Type=Software&tempOsid=Windows+8.1
Support Policy for Adobe Acrobat 7.0.x (Windows XP x64) : http://www.adobe.com/support/techdocs/331732.html
Activation not needed: Activation server shut down for Creative Suite 2, Acrobat 7, and Macromedia products
Acrobat 7 (and all legacy versions of Acrobat) update files: ftp://ftp.adobe.com/pub/adobe/acrobat/win/
Acrobat Pro 7 - FREE: https://helpx.adobe.com/creative-suite/kb/cs2-product-downloads.html Click on "English" or your language
I think that the Forum members often give more useful responses than the "experts". Even if the moderator marks a discussion with an"correct" answer from an "expert" but the answer does not solve the asker's question, please, if you know of a work-around, give the asker your solution. I am on the Forum to find workable solutions for situations where updates, upgrades and other issues have caused me a problem or stopped my program from working. Some of us have found a way to use our program in situations where "they" say it won't. Let's share our solutions. Also if you use a work-around or solution from a Forum member, please thank them.