Diversion to non-responding, suspicious sites?

Hi, It occurs to me that in many cases when I want to go to a site, the chosen URL at the top of FF's window doesn't correspond to the one that shows up at the left hand bottom corner of the window. I suspect that my browser is diverted to an advertising site, or so, while I'm wanting another one. The next situation is actual at the moment: I was searching (Google) for currency converters. I clicked the first hit, showing the URL

I landed there alright, but at the bottom line was shown - and that didn't change anymore - "Looking for host2.adhese.be...". This is funny, but I continued: I choose Euro against New-Zealand Dollar and clicked the button "Bereken de wisselkoers" (Dutch for "Calculate valuta"). I landed, according to the top line URL at (seems OK), but the bottom line showed "Searching server a.tribalfusion.com...", which seems wrong to my opinion. This searching didn't come to an end and I didn't get the answer to my calculation request.

I did the same steps with Internet Explorer, I didn't get an answer either, the only difference was that there at the bottom line could be read: "Opening page convert.cgi at

", which looks well, but I suspect the same problem shows up (maybe I have other display options set in IE than in FF), because nothing happened, there was no answer to the requested calculation.

I noticed this behaviour at many sites lately. I mailed to various webmasters informing about this problem with their sites, and asking whether it might be my PC that is in err, or whether their site could be hacked. I didn't get any answer to my mails, but the next day or so the problem didn't occur any more. So, I suspect hacking is the matter, but I'm not sure.

My questions now are:

1. Is there something wrong in my PC?
2. If so, how can I correct this problem?
3. If not, does this mean that the sites I am looking at are indeed hacked or something the like?

Could anybody answer these questions, and, if I can do something to avoid this annoying behaviour, how can I? Should I mail to all those webmasters, if 3 is true, like I did before?

TIA, Oriolus