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I have the same issues with my kids. My friend recommends me to check out WorkExaminer, it is universal tool to monitor any web usage activity and can help to block unappropriate websites. You can check here: http://www.workexaminer.com/how-to-block-websites.html
How To Use Block Sites On Google Chrome?
How To Use Block Websites On Mozilla Firefox?
There is an amazing and free solution that can be used by any one in their homes. You can also keep a track on all the websites being accessed. You can use K9 web protection to keep an eye on your child. Its a software firewall and you can visit to the blog post to Block websites in home computer. I've personaly used this freeware and its amazing.
There is several Methods about Webblocking
You can block or Unblock your websites from your Browsers Setting.
But it can be only Blocked from Particular browser.
For Block the Websites from PC Follow these Steps.
1. Go to the Your System Folder
2. Go to the Drivers Folder In that Open etc Folder.
3.Open Hosts file with Notepad
4. In Notepad go to new Line Type 127.0.0.1 and Webaddress you Want To Block.
e.g. 127.0.0.0 www.softlinkplanet.com
5. Save the File website you want to block will be Blocked.
OR There are several available tools on Internet Download one of Them
Below is the url for one application called Website Blocker. It worked for me try it.
Link for Download: http://softlinkplanet.blogspot.in/2013/03/website-blocker.html
You need to make few changes in the hosts file.for eg if you want to block facebook ,you will add 127.0.0.1 www.facebook.com For more info and screenshots,read this - http://www.superpctricks.com/2012/05/how-to-block-website-in-windows-7.h...
I use DNS settings at the router level to act as a web filter for all browsers, whether it's a computer, laptop, iPod, or smartphone -- no need for software or app downloads, no lag, etc.
I use to have Norton Online Family combined with Windows Parental Controls. The only prob was that I have 2 laptops & 1 computer with WinXP, Vista, and Win7. Then the kids got iPods for Xmas, and so it was a pain to ensure they weren't looking at inappropriate sites/vides on those things too. Norton was problematic on Firefox & didn't even work with Opera, so I tried using Microsoft Live Family Safety with Windows Parental Controls instead. Unfortunately, the app blocker on it either didn't work or just sucked overall, not to mention that the iPods were still being left out.
Now I've removed all of it except the built-in parental controls, and I just block inappropriate sites via DNS. This works on their iPods because the block is at the router level, but the catch is that it means you too, are blocked from those same sites, and so is anyone else who uses your wifi/internet. That's not a big deal for me, but if you're one to watch adult stuff or humor that may be adult in nature, you might find this cumbersome. (You can always use your smartphone's data plan if you really need this feature. LOL The kids' cellphones have data blocked via cell service provider.)
IN my router's DNS settings, I use 22.214.171.124 (others use 126.96.36.199 - 188.8.131.52). Then I tested it by trying to access RedTube & search for porn on one of the iPods, and the setting worked great. Maybe this is more of what you're looking for..? No laggy installs that need to be set up on each individual PC, no need to buy or download apps to monitor iPods, etc. I use it in conjunction with parental controls, because I still want the computer/laptop to boot the kids off or not let them log in when it's outside of the range I have set (like after bedtime on weekdays).
You can try parental control option:
The current Windows operating system has a simple process for controlling what children see online. Go to Start > Control Panel > User
Accounts then Family Safety > Set up Parental Controls. Choose whether to set restrictions for one user or all. More at the address below...