J2SE 1.4 or later cannot be found, not even after setting --jdkhome

Downloaded jstudio_ent8_dl-win.exe today and installed.
I am using XP Pro SP2
When I just run from the start menu (command is "C:\Sun\jstudio_ent8\ide\bin\runidew.exe") I get the error: "J2SE 1.4 or later cannot be found on your machine".
I've read some other postings on this case. One solution was to start the ide with parameter --jdkhome set to the jre. Since I have my jre in "C:\Program Files\Java\jre1.5.0_06" I add
--jdkhome "C:\Program Files\Java\jre1.5.0_06" to the command, so my full command is:
C:\Sun\jstudio_ent8\ide\bin\runidew.exe --jdkhome "C:\Program Files\Java\jre1.5.0_06"
However nothing happens! When looking in the Task Manager I think it reacted for a short while (less than a second) but I couldn't see which process that was starting.
I have rebooted after the install. Still no luck.
What puzzled me in the installation was that the install prompted me for a location where to put jre1.5.0_04. Obviously it didn't find that I had a jre1.5.0_06 version.
Any ideas where I should check the settings or whatever?
Best Regards
Anders

Hi Anders,
can you try to specify path to JDK not JRE in --jdkhome command line option?

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I'm not clear on some things:
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