Iron golem trembles when it walks

Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt) here.

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 13-08-2013 19:12
Description: Manually triggered debug crash

java.lang.Throwable
	at ats.k(SourceFile:1238)
	at ats.S(SourceFile:663)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['P2M666'/21771, l='MpServer', x=50,88, y=68,62, z=712,12]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-20,64,244), Chunk: (at 12,4,4 in -2,15; contains blocks -32,0,240 to -17,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 1853593 game time, 2035431 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 45 total; [rq['Cow'/21877, l='MpServer', x=126,25, y=71,00, z=670,53], rq['Cow'/21878, l='MpServer', x=125,50, y=64,00, z=671,81], rq['Cow'/21879, l='MpServer', x=120,63, y=69,00, z=716,59], rq['Cow'/21864, l='MpServer', x=86,63, y=64,00, z=762,50], ry['Sheep'/21866, l='MpServer', x=103,03, y=64,00, z=643,06], ry['Sheep'/21868, l='MpServer', x=89,06, y=64,00, z=679,97], rn['Bat'/21861, l='MpServer', x=70,78, y=21,00, z=763,22], rn['Bat'/21860, l='MpServer', x=66,68, y=18,02, z=764,28], rn['Bat'/42426, l='MpServer', x=-7,28, y=21,61, z=782,03], rr['Donkey'/21851, l='MpServer', x=44,50, y=67,00, z=693,63], rn['Bat'/42427, l='MpServer', x=2,75, y=25,79, z=784,75], rn['Bat'/42425, l='MpServer', x=-6,22, y=23,64, z=783,75], ua['Villager'/21854, l='MpServer', x=49,31, y=66,00, z=727,88], rn['Bat'/21855, l='MpServer', x=85,66, y=33,84, z=635,64], oc['entity.ItemFrame.name'/21852, l='MpServer', x=37,50, y=69,50, z=714,94], sx['entity.MinecartRideable.name'/21853, l='MpServer', x=37,50, y=68,00, z=726,47], ry['Sheep'/21840, l='MpServer', x=-2,88, y=64,00, z=682,13], rn['Bat'/21841, l='MpServer', x=4,24, y=22,57, z=749,09], rq['Cow'/21846, l='MpServer', x=0,25, y=64,00, z=670,72], rp['Chicken'/21847, l='MpServer', x=1,34, y=64,00, z=668,53], rp['Chicken'/21845, l='MpServer', x=1,47, y=64,00, z=665,56], rp['Chicken'/21835, l='MpServer', x=-3,47, y=64,00, z=665,56], ry['Sheep'/21834, l='MpServer', x=-12,22, y=64,00, z=661,88], rp['Chicken'/21833, l='MpServer', x=-4,22, y=64,00, z=665,47], rq['Cow'/21832, l='MpServer', x=-3,91, y=64,00, z=670,09], ry['Sheep'/21839, l='MpServer', x=-3,50, y=64,00, z=678,25], ry['Sheep'/21838, l='MpServer', x=-1,78, y=64,00, z=677,56], ry['Sheep'/21837, l='MpServer', x=-3,91, y=64,00, z=677,09], rp['Chicken'/21836, l='MpServer', x=-1,59, y=64,00, z=665,59], ry['Sheep'/21831, l='MpServer', x=-6,66, y=71,00, z=647,53], rn['Bat'/21821, l='MpServer', x=-25,74, y=38,43, z=720,53], rn['Bat'/21823, l='MpServer', x=-17,43, y=13,57, z=786,68], rq['Cow'/21819, l='MpServer', x=-19,78, y=71,00, z=639,22], rn['Bat'/42364, l='MpServer', x=113,25, y=36,00, z=648,69], rn['Bat'/42478, l='MpServer', x=97,65, y=38,24, z=644,94], bdf['P2M666'/21771, l='MpServer', x=50,88, y=68,62, z=712,12], rn['Bat'/42477, l='MpServer', x=110,33, y=35,97, z=651,82], rr['Lightning'/21772, l='MpServer', x=18,66, y=67,00, z=707,66], sc['Guardian'/21770, l='MpServer', x=47,06, y=67,00, z=723,53], rn['Bat'/42474, l='MpServer', x=96,25, y=38,10, z=647,75], ua['Villager'/21769, l='MpServer', x=57,31, y=67,00, z=718,56], ua['Villager'/21768, l='MpServer', x=55,47, y=67,00, z=717,19], ua['Villager'/21767, l='MpServer', x=50,16, y=66,00, z=727,31], ua['Villager'/21766, l='MpServer', x=48,41, y=66,00, z=728,00], ua['Villager'/21765, l='MpServer', x=55,84, y=67,88, z=716,50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bda.a(SourceFile:284)
	at ats.b(SourceFile:1761)
	at ats.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 234371616 bytes (223 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 788 (44128 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 4000 GL version 3.3.0 - Build 8.15.10.2618, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Better Texture
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1518 (85008 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used

OpenGL: Intel(R) HD Graphics 4000 GL version 3.3.0 - Build 8.15.10.2618, Intel

Your graphics driver is outdated, please update your graphics card drivers following these instructions: Updating Graphics Card Drivers.
In the future please use the search function to see if your bug has already been submitted.

• Do not rely on automatic searches for driver updates.

• Do not use Windows Update or Device Manager - Microsoft doesn't install OpenGL, they promote DirectX.

• If you know the brand and type of your graphics card, go to the links provided above and search manually for the most recent driver for your card. The automatic detection tools of the card manufacturers is not recommended.

No more updates, assuming no longer an issue.