Why windows do not excess the LINUX partiton

The right answer should be, because Microsoft think they are the only one in the world writing an operative system ;). Anyway, if the question is about two different computers, and you wanna access from the windows computer to the linux one disk, then you should activate the samba server on linux. This will provide windows an easy ways to access data on the linux disk. If the question is about a dual boot computer, where you have 2 different partitions, one for windows and one for linux, then you should use a third part tool to access the linux partition. If your linux partition is an Ext2 or Ext 3, and you wanna just access it in READ only mode, you can use a tool called Disk Internal Linux Reader (you can find it here: http://www.diskinternals.com/linux-reader ) or, alternatively, you can try Explore2fs ( you find here: http://www.chrysocome.net/explore2fs ) Both of them give you a read only access to the Ext2/3 linux partition, allowing you to copy files from the linux partition to the windows one. If you need a read and write access to the linux partition, you can use Ext2 Installable File System For Windows (you find it here: http://www.fs-driver.org/ ), that, with some limitation (expecially on the file access rights), give you the ability to read and write files, directories, and so on. Obviously they are free ;) Wish this can help you.

Are you trying to say you have windows and lunx on one computer? If you want your computer to open Lunx instead of windows, you have to tell it to. Windows is obviously your default and when you start up if there are two seperate OS's it gives you 30 seconds to open one or the other, otherwise the default will automatically appear.