[Triiooman]

1st computer: Add VGA 771 to the boot line. Or use the menus to select the lowest possible video setup.
2nd computer: Sounds like a bad hard drive. Does it sound like the excessive clicking on this page: http://www.drivesaversdatarecovery.c...recovery-tips/
3rd computer: From the problems you have described I don't think you've managed to get far enough to change the data on the HDD. I bet they still boot to windows. Even if you have the install process NUKES the disk. If you got far enough to the screen to see HDD info and make choices about how to install then you NUKED the disk. The install will fail with IO errors otherwise. So far everything you've described sounds like video.