Here i give you simple steps on now can you partition your hard drive and then install ubuntu on your system
Partitioning drive for ubuntu
1:Go to start menu right click on computer on the drop down menu click on manage .
2:In the next window select disc management wait for drive information to load.
3:Now right click on the the drive you want to shrink to create space for ubuntu.
4:The next box will show you the amount that you can shrink .If the amount of volume to shrink is less than the amount you want(5 Gb min recommended 15 GB) defragment your drive.
5:Now select the amount of storage you want for your ubuntu.
Creating Your ubuntu CD
1:Download the iso image of the latest version from here
www.ubuntu.com/getubuntu/download
2:Burn the iso image to a cd (CD R 80 min 700 Mb).You can use any image burning software if you dont have one download CD Burner xp from here
cdburnerxp.se
3:After burning you are ready to install ubuntu to your system.
Installing...
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