This is my answer whatI think.
I would amend the original question somewhat to include these questions, if no one would mind:
1. Does the Bible contain the literal Word of God in its entirety?
No. The Bible does not only contain the Word of God but also the recorded words of uninspired men, satan and devils. Strictly speaking, the Word of God is that which proceedeth out of the mouth of God (Matt 4:4) which abides within (1 John 2:14). Wherever this is written down in the bible, as being spoken through inspired men of God, or even inspired enemies of God (eg Balaam, Caiaphas), that is also the Word of God. Even ideas which come from inspired men of God can be regarded as the Word of God. Not just words of prophecy or those that are literally the same as what God would speak.
2. What version or translation is accurate?
They're all accurate, some more than others. Depends if we talking about 80%, 95% or 99% accurate. There's different types of accuracy and this depends on how it was translated. Some versions are more literal translations from the original texts to English, but they may lose some of the original meaning. Others may not be word for word translation but be more accurate and in line with the original intended meaning.
3. What version or translation is not?
4. How may we know if any translation of the Bible remains entirely accurate, as it has been translated through the ages?
I guess only by careful study and examination of those translations by various independent qualified experts. But even then there will be some uncertainty remaining. No translation can be 100% accurate in both word and meaning, due to the fact that translation between the original texts and English is not word for word exact.
5. What is the role, if any, of the Holy Ghost in learning an answer to these questions?
Although it doesn't take the Holy Spirit to do a translation of words into different languages, the proper interpretation of the meaning, punctuation, sentence structure etc, can be gained by help of the Spirit.