Problème JAVA

Dès que je lance Minecraft,un message apparait en disant:
Couldn't launch game
java.io.IOException: Cannot run program "C:\Program Files\Java\jre7\bin\javaw.exe" (in directory "C:\Users\MOUNIR\AppData\Roaming\.minecraft\binC:\Users\MOUNIR\AppData\Roaming\.minecraft\bin"): CreateProcess error=267, Nom de répertoire non valide
at java.lang.ProcessBuilder.start(Unknown Source)
at net.minecraft.launcher.process.JavaProcessLauncher.start(JavaProcessLauncher.java:26)
at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:453)
at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:699)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:124)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:15)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:94)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: CreateProcess error=267, Nom de répertoire non valide
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 12 more
Comment résoudre ce problème ?