It is possible if they have administrative privileges using the hidden shares like C$ (for the entire C drive), etc. However, if they somehow got administrative privileges on your computer (which would requires a series of hacks anyway) they probably could do a lot better things than accessing your shares. It's true that most "hackers" (the media is stupid, the correct term is "crackers" and "phreaks") probably won't target an individual's files, but they will try to gain elevated priveleges if possible to launch additional attacks, such as DDoS attacks. XP is more secure, though, so long as you keep up-to-date with Windows Updates (use the automatic download if always connected, or use the Tools->Windows Update command from IE often). No OS (even linux, despite what those junkies always say) is secure all the time. Even security specialists in the field (like Bruce Schneier) will tell you that nothing's uncrackable - it's only a matter of time. Just make your computer as secure as you can, keep up-to-date on patches, and don't worry so much because it's not as large a problem as the stupid media (and linux junkies when attacking Microsoft because they're successful and linux isn't) makes it. PS: This isn't an attack again linux - it has it's uses and I enjoy it for certain purposes since no OS is perfect for every problem / solution. It's just the propaganda that its primary users spew-forth!
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