silvertommy1 :
Okay, so it is asking for an OS, right? Should I buy a disc drive and install windows with a cd? I have the money.
Windows retail comes on a USB, not CD. You can also download windows using the "media creation tool" and cread your own CD or DVD. Using USB means your PC does not need an optical drive.
You qualify for an OEM copy of windows if you want it. it is cheaper by a little bit. $99.99 vs 120 for retail download.
Also if you are at school, most schools have a steeply discounted price for windows.
Yes you will want a disk drive. A good 3TB or 4TB spinning is $100. A good 500GB SSD is $130-$150. If you game you need at least 500GB to hold your downloaded games.
TOSHIBA P300 HDWD130XZSTA 3TB 7200 RPM = $75 @ newegg.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822149633&ignorebbr=1
Samsung 750 EVO - 500GB = $135 @ amazon