Ubuntu upgrade: fresh install and rearranging partitions

[ddl]

Hi. I'm using the Ideapad S12, dual boot Windows XP and Easy Peasy 1.5 [a version of Ubuntu 9.04]. i want to upgrade the Ubuntu installation to Ubuntu Netbook Remix 10.04 through fresh install: i.e.removing the older ubuntu version from my machine and installing the new Ubuntu Netbook Remix 10.04. I have 2 questions:
1. how to do it? [i.e. when do i remove the older ubuntu- during installation, or beforehand?]
2. there are too many partitions on my machine [a screen-shot attached bellow], that's how it came when i did the initial Easy Peasy installation, are there partitions here that it would be advisable to keep? [such as one the key recovery and if so in which partition it is located?] is it necessary to keep the "Lenovo" 30 GB partition? i want to add that i want to keep the Windows XP beside the would be Ubuntu Netbook Remix 10.04 [on a separate partition].
I'm writing this post from within the Ubuntu Netbook Remix 10.04 live USB, everything seems to works great, wireless out of the box through activation in System>hardware drivers .
Thanks for any help, looking forward to go ahead with the installation.

[mister2]

I'm sure someone else will chime in but this is the way I see it. You can probably get rid of sda2, sda6, sda7 and sda5. I'd check the contents of sda5 though and back anything up.

Is Windows the original Windows that came with the S12 or did you reinstall it?

[ddl]

Hi, thanks. Windows' partition is in sda2, the Linux one is in sda6 [in the repartitioning i would make it the other way round: shrinking the Windows partition to a minimum of about 20 GB only]. sda7 is Linux swap, automatically created [as it seems] during the Easy Peasy installation process. sda5 called lenovo, 30 GB, is incomprehensible to me, again seems to be automatically created during the Easy Peasy installation process, anyway, to get some idea of what is inside the sd5, some of it's content files are in attachment 1, bellow. number 2 is showing /media/LENOVO/Lenovo . number 3 is showing /media/LENOVO/drivers.

Is Windows the original Windows that came with the S12 or did you reinstall it?

It is the original Windows.
Thanks for any help and advice as to how to deal with all these partitions and get as much space as possible for a fresh Ubuntu install, while keeping Windows and its items [like the one key recovery] intact.