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Unfortunately this guide is only for windows; but is possible on any system where you can block all connections in and outbounds, and create rules exempting certain programs or files you choose that are allowed access to the internet.
In this guide we'll be using windows firewall with advanced security, to my knowledge all Vista and Windows 7 users have this. We will be making it so we block any and all programs and files that we haven't exempted from accessing the internet.
To go to it go to the start menu and search for it.. then open it.
Upon opening it you should be greeted with this screen;
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Note that the rules you currently have will most likely be different.
You'll want to go to Action at the top, then go to Properties in the menu that drops down.
You should be greeted by this;
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Note that once again the settings may be different, but you want to make them look like this on
all the profiles there, domain, public and private. Blocking all connections. After doing so click ok to save the settings.
Now to creating rules so programs you chose can access the internet...
You'll want to go back to the main menu of windows firewall then go to 'Outbound rules' which is in the left side menu.
After that go to new rule, on the right side menu.
Once there choose program, then click next, then click browse and look for the programs you want to allow access. Once you find a program you want to allow select it then click next, then select allow connection, click next again, then name the Firewall rule for that program.
Do this for each program you want to allow access.
Common places to find common programs.
Google Chrome
C:\Users\( Your Username )\AppData\Local\Google\Chrome\Application\chrome.exe
Firefox
C:\Program Files\Mozilla Firefox\firefox.exe
Screensnapr
C:\Program Files\ScreenSnapr\ScreenSnapr.exe
Internet Explorer
C:\Program Files\Internet Explorer\iexplore.exe
Now you're safe from that type of malicious crap that people fill the internet with