Use notepad++ in that you can open all of the files at the same time, then press ctrl+H to bring up the replace tool, type the from in the top box, and what you want it to change to in the seocnd box, then click "replace in all open documents", then you just close down each one and confirm the save .
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.