|"So i opened up my pc, had a look and i found a small long chord that has a small sticker near the end, that Says: HDD."|
The cable you describe here is probably a SATA cable; if your hard drive is connected with a PATA cable (a wide ribbon cable), then you don't need to worry.
Something else you might try: clean your Windows CD with a soft, dry cloth and a little Windex. It may not help, but I actually had this work one time when I was installing Win XP Home on a PC I had built. Apparently there were light smudges or film on the CD that rendered it unreadable by the drive. Like I said, it may not help, but it's worth a try.
1 Corinthians 15:3-4