Linux or vista?
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M$3 Answers
Yes its possible to use both OS as dual-boot . i dunno how far its worth to you . my self im very much satisfied with linux .
To install linux with vista , you can read it from the link im giving you bellow. its easy and efficient method.
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M$http://www.ubuntu.com/getubuntu/download
And then burn it to a CD or DVD (or ask a friend to help you with that) and then you can test Ubuntu in your computer even without installing it. If you like it how it works, you can install it, and yes you can have both Ubuntu and Vista. With only the minor annoyance to have to choose between systems at startup.
My I add that windows 7 is a much better option than Vista, if you want to keep a windows operative system, may I suggest you upgrade to 7, it's way better than Vista :)
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M$
If you want to install ubuntu without the CD check out this page:
http://www.ubuntugeek.com/how-to-install-ubuntu-linux-from-usb-stick.html
It's a step by step guide to install from a flashdrive
Is there anyway to do this without the disk?
thats exactly where you would fall in love with linux .
you can boot linux from CD itself . there are several distributions in linux offering LIVE CDs either you can download it from their site or you can order , usually it cost you around . 5 to 10 $ depending on the distribution . You can also get a free CD from ubuntu here https://shipit.ubuntu.com/
if yours is a net book and you dont have CDROM drive . you can also load it live from pendrive .