I want to get an old system to give to my sister I have all the spair parts (old keyborad mouse speakers and monitor). I found a shop that sells computers they guy was trying to sell me a celeron 300 mhz box with cd rom 10 gyg drive ethernet port enough pci slots for a pci vid card with xp pro for 160. I have no idea if its a good deal. What about updating xp will it work? is that xp OS legal or what? 160 for a 300 mhz box is it worth it?