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I've twice tried to run the windows installer for RC2. Each time it starts and goes to 100% cpu with no disk activity. The target directory is never created. On both occations I let it run for 10 minutes then killed the process. I have RC1 installed. I am running win xp home ed. with all current patches installed.
Unfortunatelly I'm not able to reproduce this issue. Please try to reinstall your jvm and try to install NetBeans again it is likely problem on your machine.
Also you can try to use ctrl+break which should do thread dump (issue looks like there is a deadlock somewhere).
*** This issue has been marked as a duplicate of 30767 ***