Lingvosoft provides Yiddish translation software for Windows. You can download trial versions, to see what works best for you.

The offerings for Yiddish are slim, but what we do have what most people are looking for. That would be the...

Yiddish Talking Dictionary (just under $50). This is what most people are looking for. Load this on your machine, and you have a virtual translation device. It delivers instant bi-directional translation of all the words and phrases in its massive database.