#1 Never use windows vista or 7 . Never use anything other then XP Pro.
I don't understand this. Even my rather cynical friends seem to like Windows 7 enough to use it, even though they tend to dislike Vista.
Microsoft has yet to make a good operating system since nt / windows 2000.
#4 when installing windows make sure that you only have the hard drive you are installing it too connected.
I honestly don't know why this should matter if you're not booting from the other hard drive or even accessing files from it.
You dont want to accidentally install windows on the wrong hard drive, i did that twice before i learned not to leave other hard drives connected.
And make sure your internet is completely disconnected
I would do this during installation, but afterwards turn on the Windows Firewall (disallowing all exceptions) and any other security measures possible before updating Windows, which I would do immediately after installing the OS and before pretty much anything else at all. Hell, I'd probably pick the service pack redistributables on a disk and update to those before connecting to the internet.
Yes durning installing, once you disable and set it up correctly then you can turn it back on.
#6 never use Internet explorer, Windows Media Player, Windows Time...
Seriously? Huh? I don't use IE8 and don't particularly like it, but it's not actually that bad and probably not terribly risky unless you're going to time-warp back to 2001, screw up your settings, and get some kind of ActiveX-related infestation going.
I don't know if WMP has any security vulnerabilities, but it's kind of crappy to begin with. I doubt this is a serious issue.
But... Windows Time? Really? Why?
Since i advise against updating windows... Since windows update has been broken since day one and i havent yet been ever able to update windows and not having to end up reinstalling the OS in a few weeks.
Windows time because you dont need it. It also use to have a security vulnerability which would allow someone to take full control of your computer. So i just say turn it off just in case

#7 never under any circumstance update windows.
Never installing updates for a Windows installation is one of the stupidest things you can possibly do. Follow this advice if you want your computer to become a security nightmare and die a horrible death at the bottom of a snake pit
Hehe, i haven't updated in about 8 years now and i have yet to get a virus or have a single problem. Most security problems have to do with alot of the crappy windows services that normaly run. Turning those off and you wont need to worry about security problems.
Also recommend turning off system restore and remote access.
#8 if you do not plan to use your computer for playing games, Use linux instead. http://www.ubuntu.com/
That's a pretty major switch just because someone doesn't play games often, although keeping your mind open to other operating systems isn't a bad thing. I've heard a few bad things about Ubuntu in particular, but I don't use Linux so I'm not sure what a good distribution is.
Last time i used ubuntu was last year and it was the best operating system i ever used in my whole life. It was so easy to setup and use and you never ever have driver problems.
#9 Never ever use Outlook express for mail. Always make sure you use a mail that you can run in firefox.
Again, why, aside from convenience?
reduces your chances of getting a virus

#10 Doing anything other then these top listed things 
So he can't type in Notepad, or play Minesweeper, or install WinAmp? I mean, those weren't on your list, so I guess he can't do them.
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Oh well no i ment, not doing other things on the computer. I ment doing the opposite of what i said above