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There should be mechanism that deletes lock file from the userdir even if the IDE is killed from the task manager. It could be done via registry record: http://technet.microsoft.com/en-us/library/cc960241.aspx http://blog.notfaqs.com/2007/10/registry-rename-file-on-reboot.html -then the lock file will have been deleted after system reboot. There may be some other ways better than it. I think it's worth investigation.