Installers won't Install

[Urkle]

On ext4 Ubuntu, Gnome base... I got this:
[code]
Although I have my system dual boot, and there's an NTFS drive that both can see. Do you think I should boot under windoze, download to the NTFS drive, then reboot into Ubuntu and try running them from that drive?

I would definitely do that.. Then try copying the files over to the ext4 system (via gnome) and re-check the md5s.. if it's STILL corrupting, I'd HIGHLY recommend getting off of ext4 and go back to ext3.