i would suggest treasury of scriptural knowledge, excellent reference of scripture. It cost maybe 20 dollars or you can get it free with e-sword. Its not a commentary but just refrences to other verses and very helpful in understanding the verse you are wondering about.As for a bibleprogram on PC the best i have seen yet is bibleworks, i think you can download a free trial or demo version before buying it, its quite expensive, i have only used it for a small amount of time but it has very much to offer.also e-sword is very user-friendly and free. with many very good resources.
_________________CHRISTIAN