You were right window operating system effects with Viruses the main reason for that it is the only operating system which were being used on widely basis and is more user friendly and if you have experience then you will know that any thing which were mostly used you were so familiar about that then after some time you have some control on it and easy to access those functions which were secure or private use. That's why for hackers its the easiest operating system to attack. Otherwise its much secure and user friendly operating system.
Microsoft windows operating systems are my all time favorite OS's since since years (started with 98 and then xp then vista and now win 7).
windows uses for for applications programs and and data base but the linux is used for security and its a open source operating system