bufferzone

Hi, on the bufferzone website http://www.trustware.com/ it has a test to check your secuirty is this test safe?

also i was gonna check how much it is and clicked on the buy link and both opera and firefox said the ceftificate is not from the source it says its from are you sure you want to continue which did worry me at least slightly any info on this?
same thing with IE 7 as well how very odd is someone trying to pretend to be trust ware?
can someone go to there sites and click on the buy link and tell me what it tells them with all there browsers.

thanks in advance
lodore