You mean just changing to Linux OS?
You have Windows XP that is an outdated and a no longer supported Operating System, to be safe specially to access the Internet you need to replace the OS. Linux is free if you want to continue using Windows you need to buy a license.
The machine is very slow because it have a very low amount of memory 512MB, the max RAM supported is 2GB in 2x 1GB PC2-4300
Even if you choose to install Linux it will work much better if you do the RAM upgrade.
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