Any ways, after a grueling 4 hr. download from HOTU, I finally got System Shock one.
I downloaded daemon tools for this alone, and now I have no clue where to go from then. So, please help, please, please help.

Start Daemon Tools, click on the small symbol on the taskbar below right, next to the clock, and the rest should be pretty easy to figure out.
Options you can safely let be how they're set already.
Click on Virtual CD/DVD-ROM, set number of devices or choose the only available device, click on Mount Image, select the ISO file on your HD. That's it, the CD is mounted and you can select is a a drive in the Windows Explorer, or it will maybe autostart. ;)