Error launching game

Everytime I try and start the game in school I get this error..... I've seen posts saying its the driver but I know its not because I tried using a different computer that another kid was already playing on but when I log into it with my information on MC it gives me this error

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 1/6/14 8:59 AM
Description: Initializing game

java.lang.NullPointerException: Initializing game
	at azi.a(SourceFile:495)
	at azi.ad(SourceFile:300)
	at azi.f(SourceFile:696)
	at net.minecraft.client.main.Main.main(SourceFile:152)


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

-- Head --
Stacktrace:
	at azi.a(SourceFile:495)
	at azi.ad(SourceFile:300)

-- Initialization --
Details:
Stacktrace:
	at azi.f(SourceFile:696)
	at net.minecraft.client.main.Main.main(SourceFile:152)

-- System Details --
Details:
	Minecraft Version: 1.7.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 5657656 bytes (5 MB) / 26808320 bytes (25 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.4
	LWJGL: 2.9.1
	OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	GL Caps: 
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: ~~ERROR~~ NullPointerException: null
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)