I'm not sure what category to place this glitch under, so I'm just gonna to say what's happening. I'm trying to play the demo of Minecraft online, and everything seems to load just fine until I actually try to play the game. When I try to play, the screen just flickers between the loading background and the menu. Then the whole thing crashes. Here's the crash report:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 7/9/13 4:02 PM
Description: Exception in world tick

java.lang.ArrayIndexOutOfBoundsException: -100
at org.lwjgl.input.Keyboard.getKeyName(Keyboard.java:421)
at bdk.a(SourceFile:921)
at dp.a(SourceFile:48)
at ch.b(SourceFile:59)
at bdk.d(SourceFile:95)
at bds.b(SourceFile:58)
at net.minecraft.client.Minecraft.l(SourceFile:1325)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at org.lwjgl.input.Keyboard.getKeyName(Keyboard.java:421)
at bdk.a(SourceFile:921)
at dp.a(SourceFile:48)
at ch.b(SourceFile:59)
at bdk.d(SourceFile:95)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdv'hunter.ashe@gmail.com'/172, l='MpServer', x=218.50, y=68.62, z=-93.50]
Chunk stats: MultiplayerChunkCache: 105
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (216,64,-92), Chunk: (at 8,4,4 in 13,-6; contains blocks 208,0,-96 to 223,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 114 game time, 114 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: 37 total; [qo'Sheep'/137, l='MpServer', x=269.50, y=68.00, z=-118.50, qo'Sheep'/139, l='MpServer', x=270.50, y=68.00, z=-115.50, qo'Sheep'/138, l='MpServer', x=268.50, y=68.00, z=-115.50, qo'Sheep'/140, l='MpServer', x=272.50, y=69.00, z=-118.50, qg'Bat'/415, l='MpServer', x=239.66, y=24.06, z=-23.53, bdv'hunter.ashe@gmail.com'/172, l='MpServer', x=218.50, y=68.62, z=-93.50, ru'Creeper'/464, l='MpServer', x=267.50, y=28.00, z=-35.50, qg'Bat'/194, l='MpServer', x=238.53, y=38.00, z=-51.53, ru'Creeper'/465, l='MpServer', x=262.50, y=28.00, z=-34.50, rv'Enderman'/463, l='MpServer', x=263.50, y=28.00, z=-33.50, qo'Sheep'/153, l='MpServer', x=296.50, y=75.00, z=-127.50, rv'Enderman'/462, l='MpServer', x=264.50, y=28.00, z=-35.50, qo'Sheep'/154, l='MpServer', x=297.50, y=70.00, z=-125.50, qo'Sheep'/155, l='MpServer', x=297.50, y=70.00, z=-123.50, qg'Bat'/216, l='MpServer', x=227.50, y=17.16, z=-29.00, qg'Bat'/217, l='MpServer', x=223.66, y=17.44, z=-28.94, sf'Skeleton'/456, l='MpServer', x=280.50, y=50.00, z=-89.50, qg'Bat'/215, l='MpServer', x=225.47, y=17.34, z=-30.50, sj'Zombie'/271, l='MpServer', x=232.50, y=21.00, z=-27.50, sj'Zombie'/441, l='MpServer', x=218.50, y=32.00, z=-46.50, ru'Creeper'/655, l='MpServer', x=274.50, y=15.00, z=-18.50, sj'Zombie'/442, l='MpServer', x=218.50, y=32.00, z=-47.50, sf'Skeleton'/654, l='MpServer', x=271.50, y=15.00, z=-16.50, ru'Creeper'/311, l='MpServer', x=218.50, y=21.00, z=-41.50, sh'Spider'/436, l='MpServer', x=288.50, y=22.00, z=-32.50, ru'Creeper'/226, l='MpServer', x=285.50, y=50.00, z=-79.50, sh'Spider'/438, l='MpServer', x=289.38, y=22.00, z=-30.47, sh'Spider'/439, l='MpServer', x=290.94, y=22.00, z=-31.09, ru'Creeper'/254, l='MpServer', x=248.50, y=24.00, z=-133.50, qr'Squid'/113, l='MpServer', x=157.81, y=57.38, z=-157.94, qn'Pig'/124, l='MpServer', x=189.50, y=70.00, z=-150.50, ru'Creeper'/656, l='MpServer', x=278.50, y=15.00, z=-16.50, qn'Pig'/123, l='MpServer', x=190.19, y=70.00, z=-148.50, qn'Pig'/122, l='MpServer', x=190.50, y=70.00, z=-147.22, qg'Bat'/420, l='MpServer', x=247.50, y=12.00, z=-100.50, qn'Pig'/121, l='MpServer', x=191.78, y=70.00, z=-149.78, qr'Squid'/120, l='MpServer', x=155.69, y=49.22, z=-104.16]
Retry entities: 0 total; []
Stacktrace:
at bds.a(SourceFile:282)
at net.minecraft.client.Minecraft.l(SourceFile:1332)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdv'hunter.ashe@gmail.com'/172, l='MpServer', x=218.50, y=68.62, z=-93.50]
Chunk stats: MultiplayerChunkCache: 105
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (216,64,-92), Chunk: (at 8,4,4 in 13,-6; contains blocks 208,0,-96 to 223,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 114 game time, 114 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: 37 total; [qo'Sheep'/137, l='MpServer', x=269.50, y=68.00, z=-118.50, qo'Sheep'/139, l='MpServer', x=270.50, y=68.00, z=-115.50, qo'Sheep'/138, l='MpServer', x=268.50, y=68.00, z=-115.50, qo'Sheep'/140, l='MpServer', x=272.50, y=69.00, z=-118.50, qg'Bat'/415, l='MpServer', x=239.66, y=24.06, z=-23.53, bdv'hunter.ashe@gmail.com'/172, l='MpServer', x=218.50, y=68.62, z=-93.50, ru'Creeper'/464, l='MpServer', x=267.50, y=28.00, z=-35.50, qg'Bat'/194, l='MpServer', x=238.53, y=38.00, z=-51.53, ru'Creeper'/465, l='MpServer', x=262.50, y=28.00, z=-34.50, rv'Enderman'/463, l='MpServer', x=263.50, y=28.00, z=-33.50, qo'Sheep'/153, l='MpServer', x=296.50, y=75.00, z=-127.50, rv'Enderman'/462, l='MpServer', x=264.50, y=28.00, z=-35.50, qo'Sheep'/154, l='MpServer', x=297.50, y=70.00, z=-125.50, qo'Sheep'/155, l='MpServer', x=297.50, y=70.00, z=-123.50, qg'Bat'/216, l='MpServer', x=227.50, y=17.16, z=-29.00, qg'Bat'/217, l='MpServer', x=223.66, y=17.44, z=-28.94, sf'Skeleton'/456, l='MpServer', x=280.50, y=50.00, z=-89.50, qg'Bat'/215, l='MpServer', x=225.47, y=17.34, z=-30.50, sj'Zombie'/271, l='MpServer', x=232.50, y=21.00, z=-27.50, sj'Zombie'/441, l='MpServer', x=218.50, y=32.00, z=-46.50, ru'Creeper'/655, l='MpServer', x=274.50, y=15.00, z=-18.50, sj'Zombie'/442, l='MpServer', x=218.50, y=32.00, z=-47.50, sf'Skeleton'/654, l='MpServer', x=271.50, y=15.00, z=-16.50, ru'Creeper'/311, l='MpServer', x=218.50, y=21.00, z=-41.50, sh'Spider'/436, l='MpServer', x=288.50, y=22.00, z=-32.50, ru'Creeper'/226, l='MpServer', x=285.50, y=50.00, z=-79.50, sh'Spider'/438, l='MpServer', x=289.38, y=22.00, z=-30.47, sh'Spider'/439, l='MpServer', x=290.94, y=22.00, z=-31.09, ru'Creeper'/254, l='MpServer', x=248.50, y=24.00, z=-133.50, qr'Squid'/113, l='MpServer', x=157.81, y=57.38, z=-157.94, qn'Pig'/124, l='MpServer', x=189.50, y=70.00, z=-150.50, ru'Creeper'/656, l='MpServer', x=278.50, y=15.00, z=-16.50, qn'Pig'/123, l='MpServer', x=190.19, y=70.00, z=-148.50, qn'Pig'/122, l='MpServer', x=190.50, y=70.00, z=-147.22, qg'Bat'/420, l='MpServer', x=247.50, y=12.00, z=-100.50, qn'Pig'/121, l='MpServer', x=191.78, y=70.00, z=-149.78, qr'Squid'/120, l='MpServer', x=155.69, y=49.22, z=-104.16]
Retry entities: 0 total; []

– System Details –
Details:
Minecraft Version: 1.5.2
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), Oracle Corporation
Memory: 858528424 bytes (818 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 3 total; -Xbootclasspath/a:C:\Program Files (x86)\Java\jre7\lib\deploy.jar;C:\Program Files (x86)\Java\jre7\lib\javaws.jar;C:\Program Files (x86)\Java\jre7\lib\plugin.jar -Xmx1g -Xms1024M
AABB Pool Size: 8675 (485800 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
LWJGL: 2.4.2
OpenGL: Intel(R) G45/G43 Express Chipset GL version 2.1.0 - Build 8.15.10.2202, Intel
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 29 (1624 bytes; 0 MB) allocated, 11 (616 bytes; 0 MB) used