Why Windoze is slow?

I started learning using windoze (Windows in Urban Dictionary) as in learning when i was third year High School. My first pc specification is 550megahertz pentium III and 128mb of ram and it's operating system is Windows 98 way back 2007.

I am using windoze for more than 4 years and still counting.

Now, why did I say it is slow?

of course as an IT student, i don't want to use just windows! I also want to experience other Operating Systems.  haha I don't want to be a Windows Professional because I want to be an IT professional hahaa kidd. I am using Linux(Ubuntu) for  1 year and still counting and compared to windows it is amazingly fast because, the power of linux is for server computing. Windows is also fast but what makes it slow is:

1. Never ending automatic updates. I believe that every release of windows is not stable in my opinion because as I observed every build has a service pack that you need to update (what the F??) another reason why you are receiving less bandwidth because of those automatic updates that is downloading while you are surfing the internet. Now, Imagine if you are the creator of let's say a system, you will not put an update to your system unless it has a BUG or it has a new features. But do you believe every service packs has a new features?
2. Lots and lots of malicious software for windows. This is another reason i think. Are you sure that some of your software on your windows are not malicious? 3 out of 5 free software you download on the internet are malicious so be careful. AND, one thing about malicious software is it does not use the resources of windows properly. Think of a malicious person who tends to do harm. Harmful on your resources so you should think first and click install later.