I actually have almost the same .reg file. I decided that it would be worth the time to learn about all of the services and stuff. So I went to blkviper, just as you did, and started with the "Gaming" reg file.
After messing around with that, I started to customize it. I liked having Windows Time automatically set itself, so I turned that back on. I do like Auto Updates, so I turned that back on by default. There were a few more...
Then I noticed that my browser couldn't remember passwords anymore :-( So I had to figure out what I screwed up. I found it, and fixed it, and fixed my reg file.
Then I noticed I couldn't share my folders/printers anymore :-( So I found the problems, and fixed it.
Then I noticed that Norton AV wouldn't auto update anymore :-( So I found the problems, and fixed it.
There were several more steps in there too. That's not including all the time it took me to learn the best settings as far as system cache (not able to set with a reg file), the best programs to optimize my computer, the random tweaks that I like. But I've learned them all now. From a clean start, I can have my computer secure and just the way I want it in less than 20 minutes.
Unfortunately, 20 minutes is not how long it took to learn all of that stuff. It took months of messing around with everything. And unfortunately, there's not a "one size fits all" registry file that will work for everyone.
So I go back to the original post -- this person is not asking about advice on a G5 vs. Alienware computer. If that were the case, then it would be different. But he's asking about an eMac. IMHO, Macs are better at staying up to date, staying secure, staying fast, etc. PCs have their place -- raw performance, software variety, compatibility with everything (though Macs are starting to catch up). But you do have to configure more and do more maintenance on a PC than you do on a Mac. I'm still a PC power user, but I just like my mac better.
On a side note -- I noticed that all the Macs in my university's Mac lab crash too. I think they're running Jaguar, but it could be older. The Dells in our labs almost never crash. I know this is funny coming after what I just said, but it's what I've noticed. Who knows? There is a little truth behind the myth that Macs never crash though -- mine doesn't. I usually reset it every week just for the fun of it.