First, make sure your drive is atleast 4gb and backup ALL your files because we need to format your drive.
Steps:
Go search and type diskpart (i've tried this without admin privilages and it works)
type list disk (usually your drive is listed as drive 1)
type:select disk 1 (mine is 1)
type:clean
type:create part pri
type:select part 1
type:format fs=ntfs quick
once done formatting (it might take a while)
type:active
close the command prompt window and open your iso file of your OS you need to install.. on windows 8 . it can open .iso files.. on other systems like windows 7.. you may need to use a virtual machine such as magicdisc: http://www.magiciso.com/tutorials/miso-magicdisc-overvi...
select all the files and copy it into the root of your drive
then if you are now ready restart your pc and change your boot order (if you dont know how.. just google it "how to change the boot order of *insert motherboard model here*)
follow the install instructions
and voila you can now install your new OS
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