I don't think this is possible with a laptop computer. There is just not enough space to add an IDE to SATA converter to a new SATA drive and then to get it back into the limited space inside the laptop case.
You would also have to find SATA Controller and several drivers that may not be available.
Your Intel 915PM Chipset does support SATA but I think you will need to replace the drive with another ATA hard drive - this is not a problem as PATA drives are available. If this had been a desktop computer with plenty of space, then it may have been possible.