Not sure what you mean by
My wild guess is that someone is using that site for their own purposes.
That site is bleepingcomputer, one of the safest sites on the net and Nobody but bleepingcomputer is using that site, I guarantee you. The link I have given you for DDS is the exact same link each and everytime. I have not changed it I have not altered it, and each one of the ones I have given you I just now checked and each and every one of them leads me directly to the bleepingcomputer DDS download page. What is happening is that your computer is being redirected by something you have put on the computer yourself.I was suspicious when you told me via email that,
Avast blocked DDS.
Windows updated 68 updates.
Mistakenly downloaded download manager. It took over IE with a search bar and other things. Getting rid of that.
and also this via PM
Download manager is running my Mozilla browser and has installed Blekke executables on my HD that finder can't locate.
I see NO blekke executables running and if they were they would show. You DO have a Blekko search bar showing as installed in your Installed Programs list.
I have no idea what you have done to get all this junk on your computer in just a matter of days but there is a chance there are some bad things on there.
There is absolutely NO way that just installing Avast would cause DDS to be blocked, or a Blue screen and black screen crash, Mozilla crash, especially on a brand new computer. UNLESS that computer has become infected.
I don't know where you got any of these programs that are installed there but since you obviously didn't get DDS at bleepingcomputer, even though that is where the links I gave ALL take you there.

Did you uninstall Avast because it doesn't show as installed.

Where did you get all of these programs below?
Sentinel Protection Installer 7.4.0
Blekko search bar
Free Download Manager 3.8
AuthenTec TrueSuite
PACE Anti-Piracy