How often do you give these raises credit?

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On the turn I feel like I have to call the raise. But should I have folded the river unimproved?

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is UTG with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img]. MP3 posts a blind of $2.
<font color="#CC3333">Hero raises</font>, <font color="#666666">7 folds</font>, SB calls, BB calls.

Flop: (7 SB) K[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB calls, BB calls.

Turn: (5 BB) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB calls, <font color="#CC3333">BB raises</font>, Hero calls, SB folds.

River: (10 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Hero calls.

Final Pot: 12 BB