How can I check what files I can remove?

[5inthetomb]

I have windows XP, and I know there is a way to check how much and what files I can remove. A friend done it for me a hile back, and I want to do it again, but can I hell remember how to.

Anyone know where I need to look?

TIA

System tools, file clean up I think. If not do a help search and type optimize.

Disk clean up.

Thanks very much