Is My NIS 2011 actually working?

Win7...IE9.....Been using NIS 2011 since 12/10.  Sometimes visit adult sites :smileysad:.  I visited one and got the "malicious website blocked" page.  For whatever reason, I elected to visit site (like a fool I reckon').   Does that mean I got infected?  Did scan later, but came up clean.  I also use MalwareBytes Free, SuperAntiSpyware Free and Ad-Aware Free as secondary scanners, all scans again clean.  Would that also mean I'm ok?

 

Reason for post is because I no longer get "malicious website blocked" pages, though  "System Status" shows  "secure".

 

Just one more off question if I may?   Is it necessary to use one of the many different online AV scanners as a 2nd opinion?

 

Maybe I shouldn't read so many different security site info web pages.  Tends to make me too paranoid.

 

Thanks

Fred