Encontrado aqui: link
- Remove, unpin or delete Adobe Acrobat icon from the Start Menu, the desktop and (if you have it there) from the taskbar.
- Go to C: > ProgramData > Microsoft > Windows > Start Menu > Programs and you'll find the "sinner" "Adobe Acrobat XI Pro" with the wrong icon. The that looks like a shortcut. Delete it!.. Close the window.
- Go to C: > Program Files (x86) > Adobe > Acrobat 11.0 > Acrobat... and find Acrobat.exe
- Right click on Acrobat.exe > Send to > Desktop
- Right click again on Acrobat.exe > Pin to Start Menu... and close the window
- Right click on Acrobat.exe - shortcut (that you just created on your desktop) > Copy
- Go back to: C: > ProgramData > Microsoft > Windows > Start Menu > Programs... and Paste the shortcut here (you need administrator privileges for that)
- Rename this shortcut from "Acrobat.exe - shortcut" to "Adobe Acrobat XI Pro"
- Close the window
- Now if you open any PDF document, the right icon will appear on the taskbar.