Sadly, your system is quite old, The RAM standards have moved forward and this RAM is no longer being used or compatible with newer systems. Your HDD likewise is old and is not overly fast. While you could take the drive out and install it into an external case to use it, its storage size makes that iffy as a good investment.
I doubt you would get that much for parts, best to find a responsible recycler to dispose of it and get a new system (Used or New)