Can someone give me a general guess as to what's involved in regards to costs & parts to "convert" my desktop to either a Core 2 Duo or Dual Core. I currently have an HP Pentium 4 Medium center computer, XP, 120 GB hard drive. I'm figuring to go to either a Core 2 or dual core, I have to buy a barebones system with the applicable fan unit, power supply, RAM, processor, motherboard & case. The rest of what is in my HP m260n Computer can be transferred into this new system, right? I want to keep XP as my operating system. I figure getting someone to do this will cost $150 for their labor & say $300 for the barebones system or is that too little? Would appreciate anyones input. Note, I'm using this computer as my second computer & my main computer a Toshiba Tecra Notebook is a Core 2 Duo.