How to Block harmfullsites or whateva you want

1. start run

2. type
notepad %windir%\system32\drivers\etc\

hosts
3. scroll down to below u will see..



# 127.0.0.1 localhost

then

# 127.0.0.1 add ur website address name

eg:
# 127.0.0.1 www.example.com


>now 'example' is blocked..