I often hear: "It crashes me every time on the sim" Most have no problem with it. You need a newer and stronger PC. It is helpful to make all Windows and graphics updates, to install the latest graphics driver. 16 GB memory or better 32GB. It also helps to limit the visibility a bit in the avatar settings. Or reset the Avatar settings to default. Internet speed should be at least 500MBite up and down, 1GBite is better. Change HDD to SSD its a dream so fast and stable. If all of this doesn't help, you should think about a new PC. SL and OS is not a game and the fiewer places high demands on the hardware.