|"i do not have anything to keep on the pc"|
That may be true, but once you erase the hard drive, you don't have a copy of Windows to put back on it. Even if you did have an XP CD, I doubt you would know where to find the drivers for the motherboard chipset, video, audio, network, etc. And I doubt you would know what to do with a Linux Live CD even if you had one. Do you even know what a "live CD" is? Do you know how to burn an ISO file to a CD? I could be wrong, but my guess is the answer to both questions is NO.
I suggest you have somebody who knows what they're doing have a look at your PC.
BTW, if there's "no ip address for wireless or with cable and rooter", how is it that you can get online with a netbook?