Ok, that good. I recommend that we just restore your old installation:
1) Stop ISPConfig:
2) cope the tar.gz files to / and then unpack them. They will overwrite the current ISPConfig installation with the old working installation.
3) Replace the current ISPConfig database with the database dump in the .sql file.
4) Start ispconfig again.
Before you do this, please make a backup of /root/ispconfig, /home/admispconfig and the ispconfig database in case anything goes wrong.