As the title says, i have Dell Inspiron 15 7559 pre-installed Ubuntu 14.04 LTS. I have no knowledge about Linux whatsoever because i've been using Windows for a long time. What i'm trying to say is, how do i remove Ubuntu 14.04 completely and install windows 7 Ultimate sp 1 version with USB? Please provide step by step from preparing the USB to Remove Ubuntu and Install windows 7. Thank you for helping!
2 Answers
You don't have to remove Ubuntu to install Windows, during windows installation bootup from disc you have the option to remove or format partitions and do a fresh install in it's place.
If you have no Windows installation disc then their is a way to create a flash drive installer: http://pcsupport.about.com/od/windows7/a/install-windows-7-usb.htm

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Urm but i have no disc reader..i can only use usb – Sol Jun 01 '16 at 05:56
Make your USB windows bootable, you can use unetbootin for that. Once you are done, connect that bootable USB to your system, go to BIOS, select USB as boot up device. When you are at Install Windows screen, press Shift+f10
. Command prompt should open up.
Type bootrec /fixmbr
into the Command Prompt. Then install windows.
After windows and all associated drivers are installed, go to Disk management
, search for any Ubuntu partitions. Delete those and extend free space so that windows partitions can use that free space.

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Ok now i've installed windows 7 ultimate on my dell. The problem is all drivers is not installed. Even the usb ports and network adapter doesn't work.. what should i do now? – Sol Jun 02 '16 at 06:42