3 minutes left of installation

Hi! I'm trying to install Mountain Lion after Yosemite caused my Macbook Pro to run very slowly. I've already wiped out my hard drive (thus rendering my Macbook Pro OS X-less). I have no back up (my external hard drive crashed months ago....) I'm using a bootable USB to install ML. The progress bar shows that the installation is 70% finished with '3 minutes' remaining. I left my laptop to install for four hours and it's still stuck on 'Retrieiving Javaessentials package'. I rebooted, tried partitioning my hard drive and installing the OS X on another partition and an external SD Card but nope, it always get stuck at the Javaessentials part. Reinstalling the original OS X through internet recovery is out of the question as my wifi connection's password is WEP and not WPA2. I've tried to change it from WEP to WPA2 but it didn't work.

Should I reinstall the installer or should I try again and wait it out?