Suite Many problems after upgrade
 

First, don't ask me to submit a support ticket, because I did that 3 days ago, and all I've gotten so far are 1(!) reply a day, none of which have included any help what so ever. So I'm turning to the rest of you, maybe you can do what the people paid to help won't bother to do (if you think I'm annoyed, you are correct).

So, here's the thing:
I upgraded from suite 4.1.11 til 4.2PL2, and since then, a whole bunch of problems have presented themselves. Before I upgraded, we had some issues concerning warnings from Google about malicious content, but someone told me that is was just something a mistake, and that nothing was wrong, so I didn't continue to look...my bad.

The weird part is that the problems I now experience differ from each other depending on which browser I use, so I have to devide them up for you.

In IE9:
I couldn't run the upgrade script in IE to begin with, so it started there. After I manged to run it in FF, I discovered that some stuff were uaccessable. On the forum itself, the Blog is missing, coming up empty. And in the AdminCP, many templated also come up empty when trying to access them, including Search in templates. Though, some seem to have returned after all my attempts to fix things.

In FF:
All templates seems there, and I can use the search templates function. AdminCP seems fine. But the forums are acting weird. Before last night, I could access the forums, but if I tried to click something that would take me to forum.php, an error message would pop up from FF saying that www.huletydyshish.ru. couldn't be found. That is not my address, nor does it have anything to do with my site. I re-uploaded the files again, and re-ran the upgrade script earlier today, and now this error message comes up on any page I try to access. For this reason, I don't know it the blog shows up in FF.

What I've done:
I've re-uploaded and re-upgraded many times.

I got my webhost to run an analysis, and they came up with a whole bunch of hacked files and files that don't belong. I've deleted all these files, including the damaged one, as those were in the Impex folder, belonging to the old phpbb forum we used years ago. The report from the host also mentions some backdoors:
Quote:
Backdoor (7,4): ./www/vbulletin/coms.php
Backdoor (3): ./www/vbulletin/install/includes/r.php
Backdoor (3): ./www/vbulletin/packages/vbdbsearch/r.php
Backdoor (3): ./www/vbulletin/vb/route/r.php

I've switched my database password.

Address: http://www.hamsterforening.no/vbulletin/forum.php

If anyone could help me, I'd be forever grateful. We're a non-profit animal association, so we can't afford to get professional help on this.