PC won't boot, 3rd slave hard disk error.

Hi! First of all, I don't know for sure if this is the right topic. If not, I'm sorry!
Since a few hours ago my pc won't completely boot.
I'm getting a 3rd slave hard disk error. And in the bios it states this:
Primary IDE Master: Not Detected
Primary IDE Slave: Not Detected
SATA 1: Optiarc DVD RW AD-
SATA 2: WDC ROM MODEL-BUCC

I have a Asus P5KPL-AM IN/ROEM motherboard and I've got 0 knowledge about pc's :p
 
If it is saying Disk 3 is having an error then I would either disconnect, or disable the 3rd drive. A bad drive could stall windows and prevent it from fully loading. Hopefully the 3rd drive is not the one with your OS on it.
 
Well I thinks it's the only disk I have, I've disconnected it reconnected it and my OS is on it. Should i reinstall windows?
 
The 3rd disc is the CD/DVD drive, not the hard drive. Disconnect it and see if the computer boots normally. If it does, replace the CD drive
 
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