If, during the install, your quota check is freezing and making the system unresponsive, and you simply want to skip this part of the install, you can do so by doing the following:
1) Type:
cd /usr/local/directadmin/scripts
edit the install.sh script. Scroll down until you fine the line that says:
./fstab.sh
Remove the line, save/exit.
2) Type:
./install.sh
This should skip over the quota check and continue the install.