There are always some risks involved when using a public computer in libraries, Internet cafes, airports, and copy shops. However, there are some things you can do to help keep your work, personal, or financial information private.
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1. Don't save your logon information
First, don’t save your log-on information. make sure you always log out of websites by clicking "log out" on the site. It's not enough to simply close the browser window or type in another address. Many programs (especially social networking websites, web mail, and instant messenger programs) include automatic login features that will save your user name and password. Disable the function that automatically saves this information
2. Don't leave the computer unattended with sensitive information on the screen
If you have to leave the public computer, log out of all programs and close all windows that might display sensitive information.
3. Erase your tracks
Delete your temporary Internet files and your history.
4. Disable the feature that stores passwords
Before you go to the web, turn off the Internet Browser feature that "remembers" your passwords.
In Internet Explorer: Click Tools > Internet Options > Content tab and then click Settings, next to AutoComplete. Click to clear the check box for User names on passwords and forms
In Mozilla Firefox : Click Tools > Options > Security tab and then clear the check box for remember password for site
In Google Chrome: Go to Settings > advance settings > Passwords and forms, clear the check box for offer to save passwords I enter on the web.
5. Don't enter sensitive information into a public computer
Finally, don’t use a public computer and type in any sensitive information. This can be difficult sometimes, but keep in mind that an industrious thief might have installed sophisticated software on the public computer that records every keystroke and then emails that information back to the thief. Then it doesn't matter if you haven't saved your information or if you've erased your tracks. They still have access to this information.
If you really want to be safe, avoid typing your credit card number or any other financial or otherwise sensitive information into any public computer.