I wish I could say that I was lazy and never maintained my computer. But I am not. I actually care for my operating system and my hardware a lot. I do not get viruses and malware unless I am curious enough to see if I can remove it on my own, which I was able to do a few times. I make sure that I have the latest updates from MS and Norton multiple times a day. Defragment regularly, depending on usage since I might be moving couple hundred gigs of data from my 80GB WD in a week. The only thing I do not do is to return the registry to its original size after and install/uninstall. So the registry balloons from 30some MBs to 50some MBs. And god knows what is going on with my drivers, since I have to change them every other week (or two).
Software has always been and always will be buggy. Humans make errors, and creations of humans in return must make errors. Anybody remember the infinite loop in Win95 that caused it to crash if you left it running for long? You would not have to do much with it, just leave it running and BAM! blue screen. Thank god for XP.
It might be true that reinstalls are not required, but I would rather reinstall than have to backup my registry, drivers and god knows what else to its original state because I decided to install the demo for a game.
Secondly, why would I turn off a program I am paying subscription for if it is not going to work properly with the other software I am using? This is something you do in order to troubleshoot, or diagnose a problem. It should not be a permanent solution to an incompatibility.
And after the reformat, Firefox and NIS are getting along so well. (And believe me it was not because I told NIS to block Firefox's internet access.)
I would be surprised if your(Seeruk) 3dmk05 score ever changed due to your operating system. Ultimately you are comparing a program that resides on an operating system to the operating system itself. Apples and oranges.
Why not measure a computer's boot times, shutdown times, IE, Firefox, Word, My Computer to launch, or how long it takes for you to right click on anything before and after a reinstall? I might be mistaken but most people would agree that there is a noticeable difference between such measurements for a system that has been running for 6 months versus a system that has been newly installed (all other factors being equal- i.e. same disk space, memory usage, start-up programs, defragmentation etc). And sometimes to a person like me, it might make all the difference in the world. Even if it is an illusion, it seems to make a lot of people happy. At least that is my take on the matter.