Is it possible?

Step 1. Go to ‘C’ drive or whatever is the name of your OS drive.

Step 2. Open up the ‘WINDOWS’ folder and then go to the ‘SYSTEM32’ folder.

Step 3. Select the ‘DRIVERS’ folder and then go to the ‘ETC’ folder.

Step 4. Or instead just open the RUN feature of windows from start menu or using the shortcut keys of win+R and put this address:- c:\WINDOWS\system32\drivers\etc

Step 5. In this folder you will see many files, just select the ‘HOSTS’ file and view its properties.

Step 6. Under the security tab click the edit button that will open another pop window here select the ‘USERS’ you want to block the sites for and check all the options under the ‘PERMISSION for USERS’ heading, {modify, read and execute, read, write}.

Step 7. Click APPLY and then OK.

Step 8. Locate the ‘HOSTS’ file again and now open it with NOTEPAD.

Step 9. Go to the last line which would be
127.0.0.1 localhost

Step 10. Add in the line beneath this line
127.0.0.1 URL_of_the_website {without the https:// and www.}

Step 11. Like if you want to block twitter insert this line
127.0.0.1 twitter.com

Step 12. You are done just save the setting and the file. Now if you try to open those websites it will show error.

Now you must be wondering what happened with this tiny line, well now this line tells the browser to point the address to the IP 127.0.0.1 which is your device only. Hence, you are unable to open the web address.

cheers

Yes,, we can. Even withouht any extra software, we can block some site. You can check your Internet Setting. there you will found the option. and second one by using Quick Heal, You can block some site  or some category of site. You can download one month free quickheal from here. https://www.quickheal.com/downloads.asp from here, you have to download Quick heal Total security. There you will found the option for blocking sites.

Thank your for your both's valueable answers but for the sake of your knowledge I have said in my question that I want to let open only 'selected 15 websites' and not any other... however, above your explanations are telling how to 'block selected sites'. Whereas, I want selected Sites should only get loaded thats it.....

Cheers...... pending

Yes you can. This union Budget Declared Negative list of service tax. like that you can also block all site except which you put in the open list. In quick heal, you can do the same. plz try it once. if you want to open only google, caclubindia, yahoo,icai, icsi than put URL of these site in the open list of quick heal, than check it out. all other website will be locked. you can open only that sites which you put in the list.

May this time you will write Cheers........I hope so.

Let me try i have started downloading it from the site.. if it came true I will for sure.