How can you lock a file folder on your pc?

I have windows 2000 and I wanted to know how you could lock a file. I have important customers information that I have on my laptop yet people always ask to check email. I cant allow even accidental view of thier information. I thought the only way to secure a file was to encode it. Does anyone know how to actually... show more I have windows 2000 and I wanted to know how you could lock a file. I have important customers information that I have on my laptop yet people always ask to check email. I cant allow even accidental view of thier information. I thought the only way to secure a file was to encode it. Does anyone know how to actually lock a file with some typw of password to retrieve info from it?
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