Problem partly solved by SuSe support after I send them my siga report.
They saw an online patch update did not complete and advised me to download ftp://ftp.suse.com/pub/suse/i386/upd...0-0.2.i586.rpm
After that I installed it with rpm -Uvh and the looping problem was disapeared. Unfortunally I still have the 'original' problem what I got after using a USB memory stick. When I make a selection in YaST is crashes with the message :
usr/lib/YaST2/bin/y2base: error while loading shared libraries: /usr/lib/YaST2/plugin/libpy2ag_hwprobe.so.2: undefined symbol: hd_busid_to_hwcfg
After that the tty settings are corrupted and I have to reset them with the command : stty sane
If I (or SuSe support) find a quick solution I'll post it here, otherwise I might open a new thread.
Offcourse suggestion are welcome in here as well.