I guess a lot of things went wrong with your installation - did you try to install more than once?
Please run these commands:
rm -fr /root/ispconfig
rm -fr /home/admispconfig
Also delete the ISPConfig database, if it exists (have a look here: http://www.howtoforge.com/forums/showthread.php?t=1102
Then unpack the ISPConfig tar.gz again and try another installation.