there should be no problem with UNINSTALLING them - if it should happen to "break" Acrobat 7 and/or 7 simply reinstall 6 and/or 7 to fix the break.
As for Adobe Atmosphere (which was discontinued but essentially incorporated into Acrobat 7 Pro), this link will provide the info you need - http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=Adobe+Atmosphere+Player
It is surprising what is available on Google
We have Adobe Acrobat 4.0; 5.0; 6.0 Professional, as well as Adobe Reader 7.0.9.
Can we delete Acrobat 4.0 and 5.0 without harming 6.0 and 7.0.9?
We also have Adobe Atmosphere Player for Acrobat and Adobe Reader. What is this for? Can this be deleted without harm?