Yeah... I understand basically nothing in Polish. Wife does the translating for me. I tell her what I want and she sends it to me in Polish.
I just wanted to show you a video where there were several streams of AVCHD video, motion titles (that's the titling editor I used), and motion HD background. Never had an issue with running out of memory on my computer (specs below). Never. That is why I was surprised with the amount of RAM being utilized on your computer. I'll have several other applications opened too (like Firefox).
If you want to read how PS16/17 is optimized for 64bit, here is the THREAD. As for Media Composer, I bypassed it when they offered it to us Avid Liquid users at a tremendously great price. The program was far more than what I was looking for and wanted to learn how to use.
After seeing some of the work that others have done with Pinnacle, I saw "zero" need to go any further up the NLE ladder where subscription is becoming the norm.
Have you run Nemo Check? It's in the Start>Programs folder for PS17.