I went to the Adobe product operating system compatibility page, clicked the See FAQ link for Adobe Acrobat Standard and Windows 7, and found this answer under Do Adobe Acrobat 9 and Adobe Reader 9 support Windows 7?
"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."