So my computer came in the mail, but I ordered it without an operating system because a good friend on mine sent me a free copy of windows XP professional (He got like 10 for free as a bonus at his work or something). Since I ordered the computer without an operating system is there anything I need to set up or install before I power it up? I want to make sure I'm not turning it on without an important chip or something. I noticed it came with an extra fan, a few extra interior cables (For extra hard drives or whatever) but also some chip thing inside a static safe package. I know a decent amount about computers but not so much the technical side, so help me out here.