Which linux?? and would it help??

[inks]

Hi everybody,
Yesterday I decided to try and do something with an old Iqon pc I had doing nothing.
When I right click my computer and properties its says:

Celeron(R) CPU 2.93GHz
2.93GHz, 480MB of RAM

It currently has windows xp running on it but it takes ages to respond to anything I try to open. I decided to try puppy linux, which I booted the pc with using a disk. All went well but when I tried to watch a you tube clip or any other clip it became jerky and slow to respond.

Would it help if I totally got rid of winxp all together and installed a linux system on to my pc??

If so which linux system would you recommend?? I just want to be able to watch you tube clips and maybe access facebook.

Thanks for taking the time to read this and I hope somebody can help.