The CPU clock rate (GHz) doesn't actually mean anything about it's speed, we need it's model number (like i5 4790 or something). PNY is just the brand that stuck the CPU chip on a board and attached a cooler, so again we'll need a model number, like GTX 750 or something. Basically all this doesn't really mean anything that we can help you with.
Movie Maker requires a Pentium 4 as it's minimum requirements, so it will run, it's just a question of how long it takes to render the videos. From a quick Google search it seems it uses the GPU too, so just try it and see. If it doesn't run fast enough, upgrading the GPU is usually a pretty simple process.