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I am getting the following error dialogue when I want to run a program. The program has previously worked and it is giving this error all of a sudden:

Warning: Unable to load Java Runtime Environment: C:\....\jvm.dll is not a valid Win32 application

I am running a 64 bit Windows 7 system and have the latest 64bit and 32bit Java versions installed. I have already tried to reinstall then to no avail.

Any suggestions?

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It sounds like the program (matlab) is a 64bit version and is using the 32bit JRE (Java Runtime Environment).

This means that the MATLAB_JAVA environment variable is pointig to the wrong JRE path or is not set.

HINT: You can set or edit an environment variable by following these instructions (but use the values in this answer post): http://www.nextofwindows.com/how-to-addedit-environment-variables-in-windows-7/

In the section "System variables" please modifiy or add the envirionment variable with the

 - variable name: MATLAB_JAVA
 - variable value: <use the path to your JRE>

For the path to your JRE check if one of them is available: 

 - C:\Program Files\Java\jre8
 - C:\Program Files\Java\jre7
 - resp. C:\Program Files\Java\jre<number>

HINT: For 64bit do not use the C:\Program Files (x86)\Java\jre<number> path because this is the default 32bit path.

Save it and you should be good to go.

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    Thank you. The program is MATLAB, and I first installed the updates automatically and when that didn't work I downloaded the offline installers and installed both the 32bit and 64bit versions via them.
    – Jonny
    Nov 26, 2014 at 10:36
  • Please open a command-prompt (Windows+R), type echo %MATLAB_JAVA% into it and post the output as comment here. It will show us which version of the JRE Matlab is using.
    – Mario Neubauer
    Nov 26, 2014 at 10:54
  • When I do that I simply get the same output as what I typed in, without the 'echo': %MATLAB_JAVA%
    – Jonny
    Nov 26, 2014 at 11:12
  • This means that the MATLAB_JAVA environment variable is not set. You can set an environment variable by following these instructions (but use the values in this comment): nextofwindows.com/… In the section "System variables" please add the variable name "MATLAB_JAVA". As variable value use the path to your jre. Check if one of them is available: C:\Program Files\Java\jre8 or C:\Program Files\Java\jre7 on your system and use the one available.Now try to start Matlab. Tell me if you more detailed instructions.
    – Mario Neubauer
    Nov 26, 2014 at 11:44
  • You are welcome! I will edit my answer post in order to show the complete solution at once.
    – Mario Neubauer
    Nov 26, 2014 at 12:02

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