Ubuntu Installer Doesn't Start from a Separate ISO Partition [Unetbootin]

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http://askubuntu.com – My PC doesn't have a working CD drive and the BIOS is too old to boot from USB drives. It has Windows 7 installed. I've split the hard drive into 2 partitions with the first one (H:) being NTFS and the second (I:) being FAT32. I've used Unetbootin (an older version of it that has the "Show all drives option", since the latest one doesn't detect the I: drive for some reason) to download Ubuntu 10.04 Netinstall to the drive I:. The procedure seemed to have went fine, but there is an issue. When I reboot the computer I don't see an option to choose OSs (Windows 7 boots up immediately) and the U (HowTos)