This looks all fine so far. In /home/admispconfig/ispconfig/tools/clamav/share/clamav are the antivirus databases.
Maybe you should just try this:
According to some benchmarks that I have read in the clamav mailing lists, the 0.90.x series of clamav takes much longer to scan a email and uses much more memory and resources when clamscan is used. They all recommend to switch to clamd instead until this is hopefully fixed in the next clamav releases.