Nmap Problems

I am working with Kali and am having some trouble with my host discovery in general. I am work with an old windows xp that I had laying around the problem is that I can't actually find it when i use nmap or any other scan for it. I have tried it both in armitage and in the console and nothing. I am picking up everything else in the house just not this one computer. Any Ideas/fixes???

anything help at all is awesome.