Hello everyone, just a quick update.I was in the same situation, Win 7 64-bit 8Gb RAM, Arduino IDE 1.6.1 won't start.Has suggested:I opened up the commands prompt (launch cmd.exe from Start button)I typed cd c:\program files (x86)\arduino then launched arduino_debug.exeI checked that the error was the VM's reservation space I opened the two files arduino.l4j.ini and arduino_debug.l4j.ini with Notepad (Run it as Admin!!) I edited both files changing -Xmx1024M to -Xmx512M Saved and rerun Arduino IDE, everything fine!Grazie Federico
I just installed IDE 1.7.4...
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