'Blocking' sites with Internet Explorer?

[BoyBach]

I need to 'block' access to certain sites that are being accessed using Internet Explorer on a Windows PC in work. Is there a setting or preference panel that I need to tinker with in Windows to achieve this? Or do I need to install software, and if so can you recommend any - free preferably?

Thanks.

 

[Stratification]

Simplest solution is to open up the "hosts" file and make an entry similar to the following:
127.0.0.1 www.blockedsite.com

It won't stop someone from accessing it if they know the IP (unlikely), but it'll loop any requests for that server right back the the machine, which means it is effectively blocked.