I have been advised that the motherboard on our desk top computer is blown. A guy from a computer shop is trying to convince me to instal a new ASUS motherboard into it, for $450. This seems excessive to me. Unfortunately, I don't know what the model number of this board is. He's suggesting using all the existing drives (including the Seagate 80G hard drive) and he'll fit 2GB ram, and the new power supply that I had already bought. He's also wanting $200 for WIN7 as well. Again, I don't know which version it is, and I also feel that the price is excessive for that as well.