Sims 3/4 problems

Hello 

I just got a new desktop for playing The Sims 3 and The Sims 4, but I can't seem to make them work properly.

1. When I launch Sims 3 it shows a black screen with a white stripe (partial maxis logo), I then have to go to desktop (windows key) and maximize the game again, which will make it continue to launch normally.
2. There is also a problem with "save and exit", whenever I use the save and exit option, the game seems to save but then freezes while closing, showing a black screen with a grey border and the loading icon in the middle. However there seems to mostly be no problem when first saving and then closing the game. I also have this problem with Sims 4. Except for these problems Sims 3 seems to work fine. 
3. 25 minutes into playing Sims 4 the screen turned black, went to desktop, then back into the game showing a white screen with only the cursor, then went back to normal in the game but with no sound on. I then closed and opened the game again, and it was back to normal with sound on, only for it to do it again. I then tried closing the game again but it froze with the menu showing. After this I tried getting the game to create a new Sims 4 folder, however the problem was still there and now the game also started lagging. I then tried to open the game again today to save my builds to library so I could make a backup of them, but the whole computer just froze so I had to reboot it. 

I am not sure what the problem is or how to fix it. I am playing on ultra settings and turning them down to high only seemed to make a tiny difference. I would think that my computer should be able to at least play with settings on high. As far as I can tell my graphics driver is updated. I've heard something about DirectX versions, but I have no idea what, how or why when it comes to that and I don't know what else to look for.