Plain 16 or 256 is not enough, except for some older kids' games. If you CAN'T choose anything above 256, then your video driver isn't installed properly. It is better to turn the machine off for several seconds, then back on. It can wipe your hard drive. Have software available to feed it if it wants drivers.
Later versions have it on, by default.
That means they will start each time you reboot. Find the start menu and delete the appropriate programs. This will give the machine more horsepower, and avoid possible conflicts, if the program doesn't need to start every time you reboot. The programs that have a checkmark are all starting EACH time. Results are unpredictable.