Scans find nothing but get "an intrusion attempt by learnspanishsz.com was blocked".

Every 40 seconds NIS says "blocked an attack by: System infected: Virut Request 2".  And I have also got messages that NIS blocked (or quarantined) trojan.zeroaccess.c, .b, gen.2 and fake.av.  I have run Safe Mode Full Scan with updated defs. and Power Eraser and they find nothing.  Also virutkiller and tdsskiller and spybot.  Nothing is found by any. 

 

Should I not go into my programs that use passwords or access other computers with passwords from this computer or am I safe to do that (since NIS is blocking)?  Also  any help on clearing this up would be Greatly Appreciated.  Thanks very much, Rory.   

 

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