NSM does not block any web sites

Hello,

 

I have installed/removed Saety Minder several times with no luck; my kids can all access the web even when all site are set to be blocked.

 

Our system:

Windows 7 Home Premium

Safety Minder 2.1.0.37

IE8 8.0.7600.16385

We use NIS from Comcast, but it is currently removed

All the kids have Standard Windows accounts.

 

Any thoughts would be appreciated.