Make that link non-click-through by giving in hxtp for http. This is a backdoor detection to install Worm Autorun. It involves this site that dishes out the following malware payload: TDSS, Worms, and Trojan Attacks. Well the attack works for not fully updated and patched Windows Systems, that can get infested with malware all sorts.
Wait for one of the qualified removers here to further assist you with eventual cleansing of additional malware, As long as the Network Shield blocked it, you probably had a lucky escape because of your avast av protection, and your OS came away unharmed,
Info on that particular IP: http://malwaresurvival.net/2011/06/01/rogue-dhcp-routes-users-to-malware-attacks/ link author = malware survival