I had a chat with tech support about receiving a warning during installation saying something like "Not Windows Logo Certified" and not to install the software as it could make the computer unstable or inoperable. To keep it short, I was sent an email with instructions that directed me to download a file called McPreinstall.exe and that would fix the problem. As soon as the program started, all desktop icons disappeared except for 6 Microsoft desktop icons, such as recycle bin, my computer etc. My heart leapt to my throat but I decided to let the program run its course.
Two hours later the program did not appear to have ended. I decided to see if my programs were still there and it was just the icons gone. I clicked on start, went up to programs and 90% of everything I had installed on the computer was no longer listed. I came back for another chat with tech support. I was told in this chat session that the latest version of McAfee would not work on a dial up connection. I disagreed as the computer I was using (and am using now) has a dial up connection and has McAfee 2010 installed. We then had a conversation about my connecting an unprotected computer (the one with the problem) to the internet to chat with support and his claim that the computer would be safe as the McAfee website blocks hackers. I ended the chat and went back to my problem computer.
I decided to try a system restore and see if everything would magically be back. I clicked on start, programs, accessories and noticed that system tools was greyed out. I could not access any system tools this way. I clicked on start -> Help and Support, searched for system restore and accessed it that way. I performed a system restore and yes, magically and thankfully, everything was back. My desktop icons were back, the programs I installed were back in the start -> programs menu and my system tools were back as well.
I don't know what McPreinstall.exe is supposed to do and I will never run it again. When it ran it minized itself into just a menu bar above the start button. It never displayed anything about its status as it ran. Nothing.