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Error starting idea64.exe

When I try to open idea64.exe (a 64-bit version of IntelliJ IDEA), I get the error message "No JVM installation. Reinstall the product or install the JDK".

Why is this? I have installed the update kit for Java 8 Update 5 (64-bit) and Java SE Development Kit 8 Update 5 (64-bit). In addition, idea.exe (32-bit) works fine

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According to JetBrains , idea64.exe uses this JDK search sequence:

IDEA_JDK_64 environment variable ..\jre64 directory system Registry JDK_HOME environment variable JAVA_HOME environment variable

If IDEA cannot automatically detect your JDK, try setting IDEA_JDK_64.

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