How do I create a password?

With WinME, how do I create a password that would prompt a user upon booting? I'd like to create ONE user and ONE password ONLY to prevent others from getting on my computer. I want to keep them from using my computer totally, not just accessing the internet. Please tell me how I can do this.

Specifics:
Sony Vaio Desktop
WinME
AT&T DSL

Not sure what other information is neeeded here.
Thanks.

See if you can setup a bootup password in the CMOS/BIOS Setup. (On the Sony Vaio I think you press [F2] while the Sony logo is being displayed. Or, it may be [Esc] followed quickly by [F2]).