You old pc might not have the sata plugs. I have heard of pci adapter cards you can buy to use sata on older pcs, but you'll probably need a power plug adapterfor the harddrive as well since sata use a different power plug.
This is the adapter for the power.
Newegg.com - COOLMAX SATA POWER ADAPTER Cable - HDD Accessories
I found this adapter don't know if is the right one i never used one myself
Newegg.com - StarTech IDE2SAT IDE to SATA Drive Mounted Adapter - Adapters & Gender Changers
I see slot of sata adapters on newegg, but man they are expensive.
maybe someone else can point you to a good card and better price
ohh my bad i dint see that part i better get some glasseslol