Re: hard drive question
It's a program that will tell you the installation key of your current OS. He is suggesting that you illegally download a copy of your OS and then using the key discovered by the program to reinstall the OS.
If all you have is one IDE hard drive and one CD/DVD drive, then a single IDE connector would be enough. But if have more than two IDE devices, you'll either need to find a board with at least two IDE connectors, or buy new drives that are SATA compatible.