Seriously PokerStove is not that hard to use:
(edit: OK the board is different from what you said but I'm not Stoving these hands again.)
You have bottom set, Opp has 2pr, higher set or straight only (rainbow board) your a 46/54 dog:-not bad if you think of dead money, and the possibility they could be bluffing:
157,410 games 0.005 secs 31,482,000 games/sec

Board: 5h 6d 7c
Dead:

equity win tie pots won pots tied
Hand 0: 45.850% 44.20% 01.65% 69568 2604.00 { 55 }
Hand 1: 54.150% 52.50% 01.65% 82634 2604.00 { 77-66, 98s, 75s+, 65s, 43s, 98o, 75o+, 65o, 43o }


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Opp has 2pr, higher set, straight, nut straight draw only, your 52/48 ahead!
210,870 games 0.016 secs 13,179,375 games/sec

Board: 5h 6d 7c
Dead:

equity win tie pots won pots tied
Hand 0: 52.131% 50.62% 01.51% 106748 3180.00 { 55 }
Hand 1: 47.869% 46.36% 01.51% 97762 3180.00 { 88-66, 98s, 87s, 75s+, 65s, 43s, 98o, 87o, 75o+, 65o, 43o }

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His range is possibly also include AA KK etc:
Opp has 2pr, higher set, straight, straight draw, overpair, and your 57/43 ahead.
246,510 games 0.016 secs 15,406,875 games/sec

Board: 5h 6d 7c
Dead:

equity win tie pots won pots tied
Hand 0: 57.372% 55.73% 01.64% 137384 4044.00 { 55 }
Hand 1: 42.628% 40.99% 01.64% 101038 4044.00 { KK+, 88-66, 98s, 87s, 75s+, 65s, 43s, 98o, 87o, 75o+, 65o, 43o }

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I know this is an overly simplistic way of looking at it, cus there is much more things to think about, reads etc, or I haven't factored in if Opp would play this w a flush draw, but just play around w PokerStove, its fun!
I also havent factored in whether one particular hand is more likely then the other, but you get the picture, your not that far behind, if at all with bottom set on the these boards.
Reads come in useful too, if Opp is an over-aggro donk, get it in - if Opp is a super weak tight nit, then think twice, etc etc.

But of course Miffed puts it so much better!!