Fallon: I've got Hacker's Challenge 1 and 2 - both are excellent books for network security forensics - as well as teaching network security at decent level.
As to sandeep, first thing you'll want to do is open up Computer Manager and go to Shared Folders and see what you're sharing. Also while you're in there, disable any users that you don't actually need (ie: your account should be the only user that needs to be enabled).
After that, go grab a firewall (Tiny Personal Firewall, Zone Alarm, etc.) and work on configuring that. By default, without any of that stuff, you're not terribly insecure, as long as you keep up to date on WindowsUpdate patches, but you've still got some open places. After setting up a firewall and doing other stuff, you're a bit more protected.
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Eat antimatter, Posleen-boy!
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