Wireless transmissions on a public hot spot are typically unencrypted, and thus exposed to snooping. All computers on a public hot spot are typically exposed to each other, and thus vulnerable to network attacks.
Use a software firewall
A good software "firewall" will protect your computer from network attacks.
Make sure you are using strong passwords on all system accounts (including Administrator) and on all user accounts.
When Using Microsoft Windows
Use Simple File Sharing (Windows XP only); or
Make sure that all network shares are secured with strong passwords (all versions of Windows). Use Control Panel, Administrative Tools, Computer Management, Shared Folders, Shares to review and check Properties of all network shares
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