First off, as was stated, we need more information to provide the full and correct answer.
What happened with your system?
Why are you changing the hard drive to correct the problem?
A SATA drive and an EIDE drive are not interchangeable and require different controllers. SATA drives use a small connector. EIDE drives use a 40 pin connector with 80 wires in the cable.
If you computer is a laptop, you will need to get a SATA drive to replace your existing SATA drive. You cannot convert a laptop from SATA to EIDE.
Next, you will need to install your operating system, device drivers, and application software.
Finally, you will need to recover your files from the old hard drive. If the old drive failed, and the files are valuable to you, your best option will be to use a data recovery service. The cost of data recovery from a failed hard drive starts at $200 (US).
If you are not used to working with computer hardware and software installation, you might be better off taking your computer to a local repair shop.
Chas