Can someone tell me if it`s possible to lock individual folders in a computer for security purposes?

I have several other people that use my computer, and I am trying to find out if I can lock certain folders to resrict accsess. eg. banking information ect…. Thanks guys.

Hacker Ryan Cleary charged with five computer crime offences – Wired.co.uk

Ryan Cleary, the 19-year-old hacker who was arrested by FBI and Scotland Yard officers earlier this week, has been accused of launching DDoS attacks at websites, and has been formally charged with five computer … That’s a network of virus-infected …
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Identify all the potential security threats on a home personal computer. Identify some of the techniques an at?

Identify all the potential security threats on a home personal computer. Identify some of the techniques an attacker might employ to access some information on the system.