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This is what the crash report said:

---- Minecraft Crash Report ----
// Why did you do that?

Time: 4/5/14 4:57 PM
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 azl.ad(SourceFile:325)
at azl.f(SourceFile:696)
at net.minecraft.client.main.Main.main(SourceFile:148)


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 azl.ad(SourceFile:325)

-- Initialization --
Details:
Stacktrace:
at azl.f(SourceFile:696)
at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
Minecraft Version: 1.7.5
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode, sharing), Oracle Corporation
Memory: 4611976 bytes (4 MB) / 26742784 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: 1.7.5
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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Please identify the problem and help me rectify it. I have just installed it and there are no mods.

´

Quote from abcd0987

This is what the crash report said:
...
org.lwjgl.LWJGLException: Pixel format not accelerated
...

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

Looks like u Graphiccard driver don't support openGL. Try to upgrade u Graphiccard driver. (If u use ATI Graphiccard driver DON´T use the BETA Driver)

Quote from Ritter_Kaldor

´

Looks like u Graphiccard driver don't support openGL. Try to upgrade u Graphiccard driver. (If u use ATI Graphiccard driver DON´T use the BETA Driver)

Oh, okay. Is there any other way without getting a new graphic card? Also, I had this game about half a year back and then it worked just fine (I had windows XP). I upgraded it to windows 7, installed it back and then it doesn't run at all. Not even on minecraft version 1.6.4. Any ideas about that?

Quote from abcd0987

Oh, okay. Is there any other way without getting a new graphic card? Also, I had this game about half a year back and then it worked just fine (I had windows XP). I upgraded it to windows 7, installed it back and then it doesn't run at all. Not even on minecraft version 1.6.4. Any ideas about that?

With the new Minecraft and the newer lwjgl u need an openGL 2.x capable Graphiccard.
If u have luck u only need newer Graphiccard Driver with openGL 2.x support.

Quote from Ritter_Kaldor

With the new Minecraft and the newer lwjgl u need an openGL 2.x capable Graphiccard.
If u have luck u only need newer Graphiccard Driver with openGL 2.x support.

Ohkay. Thanks a lot man

Quote from abcd0987

Ohkay. Thanks a lot man

If u need more specific look her:

https://help.mojang.com/customer/portal/articles/325948-minecraft-system-requirements