google gives the warning through Chrome.
Where's Google come into it? You're not searching Google for Vivaciti so as to access it, are you? You said you were going directly from a link in their sig.
Up to this evening a Google search for vivaciti.net took you to their homepage, but now it gives you:
Warning - visiting this web site may harm your computer!
and refuses to take you there.
Whereas, at least since the start of this thread, a Google search for shersby.net tells you on the results page "This site may harm your computer." and blocks you from visiting it.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 17 Meg Untweaked 19 Meg Tweaked WBC