Installer script removed a buch of 64-bit files and replaced them with 32-bit ones, how do I get them back?

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http://askubuntu.com – I ran this installer script to get some drivers for my printer, however I noticed that it started removing some of my programs, as well as 64-bit system files, and started replacing them with 32-bit ones! Luckily, I managed to cancel the operation before it did any serious damage. I also noticed that offical PPA's for 32-bit files were added. Should I remove them? So how do I get these files back? (HowTos)