Hi stick462,
What is the version of Adobe Acrobat / Reader you are trying to install on Windows 7. Was it working before on the same machine?
Also, you may try to uninstall Adobe Reader/Acrobat using cleaner tool if the version is 9 or above: http://labs.adobe.com/downloads/acrobatcleaner.html
Try reinstall again and let me know.
Regards,
Ajlan Huda.