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I tried to start up MC. But when I logged in and everything, it crashed me, This is the file that has crash reports I copied it;
---- Minecraft Crash Report ----
// Uh... Did I do that?
Time: 22/05/13 5:11 PM
Description: Failed to start game
java.lang.RuntimeException: javax.imageio.IIOException: Can't create cache file!
at awv.c(SourceFile:100)
at awv.a(SourceFile:92)
at awv.<init>(SourceFile:56)
at net.minecraft.client.Minecraft.a(SourceFile:248)
at avv.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:507)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.imageio.IIOException: Can't create cache file!
at javax.imageio.ImageIO.createImageInputStream(Unknown Source)
at javax.imageio.ImageIO.read(Unknown Source)
at awv.c(SourceFile:98)
... 6 more
Caused by: java.io.IOException: Access is denied
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.checkAndCreate(Unknown Source)
at java.io.File.createTempFile(Unknown Source)
at javax.imageio.stream.FileCacheImageInputStream.<init>(Unknown Source)
at com.sun.imageio.spi.InputStreamImageInputStreamSpi.createInputStreamInstance(Unknown Source)
... 9 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.6.0_31, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 462463848 bytes (441 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 6900 Series GL version 4.1.10750 Compatibility Profile Context, ATI Technologies Inc.
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: ~~ERROR~~ NullPointerException: null