I am a very big fan of Linux, especially the distributions Debian and Ubuntu (last one is a modified version of Debian, more userfriendly), also Zenwalk is a nice alternative, you should use it rather than Windows!!! It is free, OpenSource and you can choose the language you want to use it (even rare languages!!) and which programms you want to install; also free of charge/without paying!!
Ubuntu (the CD is completly free, even shipping you do not need to pay; only waiting for several weeks if you have very slow internet connection)
Please Note: The German Servers are the fastest, especially the "Esslingen" one...