Uly I know you are so happy with windows and good for you ... i will give you my own reason
a) I can have 4 desktop at the same time with out using third party application ( you can not do that with windows )
b) I have thousands of dollars worth of software for no cost ( you have to pay for most aplications on windows)
c) Comes with a complete development environment, including C, C++, Fortran compilers, toolkits such as Qt and scripting languages such as Perl, Awk and sed. A C compiler for Windows alone would set you back hundreds of dollars.
d) operating system that is easily upgradeable. after any length of time a typical installation of windows and software gets into a complete mess. often the only way to clear out all the debris is to reformat the hard disk and start again. Linux however is much better for maintaining the system
c) Supports multiple processors as standard.
and the best thing is excellent networking facilities
if you like to have fun with you pc look what you can do
http://www.youtube.com/watch?v=Y4wB3GUemVw