Can't download game

I'm getting the following when we try to download Minecraft and play it

A fatal error has been detected by the Java Runtime Environment:
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1. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x2a3b3e88, pid=5096, tid=3636
   #

2. JRE version: Java(TM) SE Runtime Environment (7.0_45-b18) (build 1.7.0_45-b18)

3. Java VM: Java HotSpot(TM) Client VM (24.45-b08 mixed mode windows-x86 )

4. Problematic frame:

5. C [ig4dev32.dll+0x3e88]
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6. Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
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7. An error report file with more information is saved as:

8. C:\Users\eimear\AppData\Roaming\.minecraft\hs_err_pid5096.log
   #

9. If you would like to submit a bug report, please visit:

10. http://bugreport.sun.com/bugreport/crash.jsp

11. The crash happened outside the Java Virtual Machine in native code.

12. See problematic frame for where to report the bug.
    #
    AL lib: (EE) alc_cleanup: 1 device not closed

Can you advise what needs to be done so we can download and play the game?