Are you able to use a completely different pc or laptop to try? See if you get the messages on that pc/laptop?
I could, but better still I will no longer use the forum as I believe it has been compromised.
Just to repeat myself again, this is the only site that I get this problem, it does not happen on any other site.
It's been fun reading and posting on here, but I just do not want to risk my lap top being infected by this site.
Bye Bye
It is not the forum???
There is no way malicious code can be uploaded to the forum without having someone log into the server and upload it themselves, the admins can confirm whether or not that has happened by checking ftp logs.
Your computer has already been infected and malware is injecting malicious javascript into the browser when you try to access the forum hence why security essentials blocks it.
You never tried the several malware removal tools I suggested as obviously security essentials isn't doing a very good job. In actual fact microsoft has said people should be using something else now rather than MSE as it is sub-par to third party solutions.
Why the malware singles out TMF I don't know, malwarebytes identified PuP's which you say is not significant in actual fact it is, those potentially unwanted programs could likely be the source of your problems.
Why don't you go and re-install windows or restore to an earlier date which will solve all of these problems.
The only other thing i can think of is your routers default DNS server has been compromised as your screenshots say its blocked x website hosted by TMF, potential redirect? Change ipv4 dns server to 8.8.8.8 and 8.8.4.4 (googles dns)