First this sounds as if your hosts file has had mcafee.com or similiar added to it that would preclude connections to it.
have a look at the hosts file it is in c:\windows\system32\drivers\etc
If it has any additions other than 127.0.0.1 ie to mcafee sites try this
Restoring a basic HOSTS file (Windows XP-Vista)
Link-> hosts.exe by secured2k
Also scan your Pc with both of the following
Malwarebytes Installer Download Link (Clicking on the links below will immediately start the download dialogue window.)
Malwarebytes Manual Updater link
Next, download the SuperAntispyware program and the manual updater from the links below. After running the Malwarebytes tool above, if you still can't download and install it directly from the problem machine, download it on a friend or family member's computer as well. After installing and updating SuperAntispyware, run another full system scan and delete everything it finds as well. As before, you may need to rename the installer file to get the program to install.:
SuperAntispyware Manual Updater
My host file did have a slight change, but it was something that I was aware of, but still, I changed it back. I tried downloading and using the programs, but my Internet Explorer could not display any of them on my computer. I downloaded them on another, other than the manual updater for the first one as the link you gave doesn't work. I installed the first one, but it does not run, and the second will not install.
More help please.
While I'm here, I might as well ask you guys about this too: I keep getting this strange pop-up like thing that insists that it is from Microsoft. I've been clicking don't allow so far, since I'm unsure if it is another trojan trying to get in. Is this something I can actually trust?
Ok 2nd link doa atm but the 1st should have installed it.
Try resetting your Internet explorer. After you have done so reactivate the addons ie Site advisor
I found this re the popup and Malwarebytes not running you need to rename the mbam.exe file to say Chris.exe (read the thread)
The links I see for the popup recommend you download hijack this and post on 1 of the forums that analyse the resultant logs.
For stubborn infections that nothing seems to budge try using an application called "Hijackthis" and posting its log on one of the forums below. They will check it and help you get rid of whatever ails your machine.
Do not post the log here, we can't help!
Post the logs at a specialist Forum:
BLEEPING COMPUTER FORUM
GEEKS TO GO FORUM
MAJOR GEEKS FORUM
MALWARE REMOVAL FORUM
SPYWARE INFO FORUM
WHAT THE TECH FORUM
Be sure to read all the sticky announcements/instructions at the top of each malware forum!