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Cannot start netbeans 5.5 beta anymore, because of the exception.
Created attachment 30952 [details] log file
It looks like your installation of Netbeans is somehow heavily corrupted, or at least configuration in user directory (C:\Dokumente und Einstellungen\hjuskewycz\.netbeans\5.5beta in your case) is corrupted. I dont't know how you got into such state (did you remove some modules?), but I would recommend reinstallation, which will fix the issue for sure. Technical background - menu folder in layer in default filesystem isn't found, which means either module jars are corrupted somehow of some other fatal error.
yes i thought that something is wrong with the modules. the mystery is why, because i didnt do anything. i just closed netbeans in the evening and wanted to open it the next day and then the installation was broken. nothing happened between. i actually had only one project at this time. the project was about creating a web service for my study. a re-installation solved this problem. Maybe Netbeans corrupted a jar while closing? If this additional information doesnt help, just re-close the bug.