Webroot SpySweeper may prevent SpywareBlaster from enabling Restricted Sites protection. This is a known issue. See the discussion here
The following work-around should allow you to enable protection in SpywareBlaster:
1. Disable the SpySweeper "IE Security Shield".
2. Open SpywareBlaster and enable all protection.
3. Re-enable the SpySweeper "IE Security Shield".
If you find the workaround is too much trouble every time you update SpywareBlaster, you can just disable (uncheck) SpySweepers IE Security Shield while adding Restricted sites. To do this see Post #5