How do you get it to work better

how do you get the videos on youtube to not stop playing so suddenly because its always happening and it gets annoying

If it temporarily stops during the video that's either too little memory or the transfer rate over the Internet connection is too slow. If your hard drive runs constantly when you're doing a lot of different things, that's a sign of limited memory.

If you don't have a graphics card on the machine, a card with onboard memory would likely help.