Try version XI of Adobe Reader.
I tried the XI version, I installed it under Vista Home Premium and works fine, but I'm still worried because, according to what I read, Reader XI is not designed for the Vista operative system.
So I tried again the Vista X 10.14 and works fine. But I'm wonder why the "sign" panel dissapears when I install Reader X with other languages.
The "sign" panel is only available in the englisch version of Adobe Reader X.