Miért Crash-el a Minecraftom?

---- Minecraft Crash Report ----

// Uh... Did I do that?

Time: 2015.09.13. 10:52

Description: Initializing game

org.lwjgl.LWJGLException: Pixel format not accelerated

at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)

at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)

at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:252)

at org.lwjgl.opengl.Display.createWindow(Display.java:306)

at org.lwjgl.opengl.Display.create(Display.java:848)

at org.lwjgl.opengl.Display.create(Display.java:757)

at org.lwjgl.opengl.Display.create(Display.java:739)

at bsu.am(Minecraft.java:635)

at bsu.aj(Minecraft.java:471)

at bsu.a(Minecraft.java:390)

at net.minecraft.client.main.Main.main(SourceFile:120)

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

---------------------------------------------------------------------------------------

-- Head --

Stacktrace:

at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)

at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)

at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:252)

at org.lwjgl.opengl.Display.createWindow(Display.java:306)

at org.lwjgl.opengl.Display.create(Display.java:848)

at org.lwjgl.opengl.Display.create(Display.java:757)

at org.lwjgl.opengl.Display.create(Display.java:739)

at bsu.am(Minecraft.java:635)

at bsu.aj(Minecraft.java:471)

-- Initialization --

Details:

Stacktrace:

at bsu.a(Minecraft.java:390)

at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --

Details:

Minecraft Version: 1.8

Operating System: Windows 7 (x86) version 6.1

Java Version: 1.8.0_60, Oracle Corporation

Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation

Memory: 37065976 bytes (35 MB) / 82108416 bytes (78 MB) up to 518979584 bytes (494 MB)

JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M

IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

Launched Version: 1.8.0a

LWJGL: 2.9.1

OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.

GL Caps:

Using VBOs: No

Is Modded: Very likely; Jar signature invalidated

Type: Client (map_client.txt)

Resource Packs: []

Current Language: ~~ERROR~~ NullPointerException: null

Profiler Position: N/A (disabled)