I believe only the newest version is compatible for Windows 7. Acrobat 7 is certainly too old.
Some information to consider.
End of support :: Adobe Reader and Acrobat versions 7.
Version 7 - Adobe Reader & Acrobat :: End of Support = December 28, 2009.
Steve Gottwals' blog entry.
Do Adobe Acrobat 9 and Adobe Reader 9 support Windows 7?
Yes. Adobe will support Windows 7 with Acrobat 9 and Adobe Reader 9.
Adobe has tested Acrobat 9 and Adobe Reader 9 software on Windows 7 and found our solutions perform to our high standards of quality and performance.* Earlier versions of Acrobat and Adobe Reader may run on Windows 7.
However, Adobe does not support Acrobat 8, Adobe Reader 8 or prior versions on Windows 7 and does not plan to release updates to those versions for Windows 7 compatibility.
* Adobe is confident that Acrobat 9.2, Adobe Reader 9.2, Acrobat Connect, Adobe Presenter, Adobe LiveCycle Designer, and Adobe 3D Reviewer will perform as expected. While we have performed expansive testing on Windows 7, there may be unexpected issues that were not discovered during our testing efforts.
Do Adobe Acrobat 9 and Adobe Reader 9 require updates to be compatible with Windows 7?
Yes. Acrobat 9.2 and Adobe Reader 9.2 are required for compatibility with Windows 7.
What about older versions of Acrobat and Windows 7?
If you own Acrobat 6, Acrobat 7, or Acrobat 8 software, you are eligible for an upgrade to Acrobat 9.
Acrobat 7 will not work with Vista.
It is so old that Adobe has announced that it is dropping all support of this version.