I launched it after installing it (at work, onto a freshly imaged Win 7 work computer, with a valid license) and it displayed in Chinese and was asking the license. I entered it and it was still displaying its menus in Chinese. Uninstalled, re-installed. Same problem. Do try: Go to Edit > Preferences > International > and you should be able to change it to English from there.
To solve I did Regedt32 (or Regedit) and in HKey_CURRENT_USER, Software, Adobe, Adobe Acrobat, 11.0, Language edited the value of the key named (default) from no value to EN-US