I have a cd of 8;10 version, should i use this or get the latest CD

it installs along with windows if there is enough free space. you need to successfully resize windows c: or d: or other partition, making it smaller and in appeared free space create 2 partitions for linux.
to upgrade from 8.10 to 9.10 you need to upgrade to versions between them, so install new version.

I would just get the Cd and install 9.10 from there just to be in the
safe side, and you can keep windows vista and Ubuntu together, you
just have to have enough space in your memory, some computer have
shown problems when doing that, it is mainly caused by a low ram, so i
would suggest to keep only Ubuntu on your computer, although you can
make a virtual PC in your computer and keep windows there, if there
any any problems ONLY the virtual PC will get harmed not your
computer.

On Sat, Feb 13, 2010 at 12:02 PM, q.dinar
<email address hidden> wrote:
> Question #100966 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/100966
>
>    Status: Open => Answered
>
> q.dinar proposed the following answer:
> it installs along with windows if there is enough free space. you need to successfully resize windows c: or d: or other partition, making it smaller and in appeared free space create 2 partitions for linux.
> to upgrade from 8.10 to 9.10 you need to upgrade to versions between them, so install new version.
>
> --
> You received this question notification because you are an answer
> contact for Ubuntu.
>

--
Regards,
Sonny Dhillon

https://help.ubuntu.com/community/Installation
http://www.ubuntu.com/getubuntu/releasenotes/910
https://wiki.ubuntu.com/KarmicKoala/TechnicalOverview