Mcafee virus scan would quarantine only suspected files and neutralize them so that they do not cause any harm for the computer and wont delete any operating system files. This non responsive nature of the programs could be due to a spyware .
Please let me know the following details so that we could proceed accordingly,
What is the computer’s operating system ?
Open security center and let me know whether it states Am I protected YES or Your computer is secure ?
You have a hijack trojan in your computer, sounds like it is sysguard,
Go to win explorer, documents and settings, user name, local settings, application data and look for sysguard,exe
Also try malwarebites, it is a free program that removes most trojans from computer, I just removed that virus from my computer last night, McAfee did not even detect it
Here is a link for the download: http://www.malwarebytes.org/
I have a similar problem. This morning I had a whole bunch of messages from Windows secuirty center about a Trojan. I scanned my laptop with McAfee. It quarrantined a Trojon called Artemis. Now I cannot open my email from the Task bar. Every time I open IE or anything at all, a Window pops up for file type association. My touchpad work properly and half the icons in my icon tray are gone.
I tried that but after the download I get the same window wanting to know what program do I want to use to open the .exe file