2 quickie hands from last night that confused me

#1: Villain is 44/9/1.18

Party Poker No-Limit Hold'em, $1 BB (6 max, 6 handed) converter

Hero ($107.35)
Button ($41.25)
SB ($29.30)
BB ($88.78)
UTG <font color="red">villain</font> / ($78.65)
MP ($103.70)

Preflop: Hero is CO with J[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.50.
UTG calls $1, <font color="#666666">1 fold</font>, Hero calls $1, <font color="#666666">1 fold</font>, SB (poster) completes, BB checks.

Flop: ($4) 4[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, villain checks, <font color="#CC3333">Hero bets $3</font>, SB calls $3, BB folds, villian calls $3.

Turn: ($13) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">villain bets $5</font>, <font color="#CC3333">Hero raises to $15</font>, SB folds, villian calls $10.

River: ($43) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">villain bets $15</font>, Hero ???

Can I call 4:1 here?


#2: Villain is 43/15/1.13

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter

UTG (villain) ($75)
MP ($163.75)
Button ($100.83)
Hero ($91.75)
BB ($98)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img]. UTG (villain) posts a blind of $1. Hero posts a blind of $0.50.
UTG (villain) (poster) checks, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero (poster) raises to $4.5</font>, <font color="#666666">1 fold</font>, UTG (villain) calls $4.

Flop: ($11) 6[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $8</font>, <font color="#CC3333">villain raises to $25</font>, Hero ???

I know this is a common situation but I wasn't any less lost. This was his first hand after sitting down and I didn't feel like finding out if he had KQ or a set. Is this generally worth a call?