Originally Posted by Burst75
3 would be what i want to install linux on.
Linux installers generally want to install into unpartitioned space, not into existing partitions.
So before installing Linux, you should delete the partition that you wanted to use for installing Linux. I assume you didn't have contents in that partition that you want to preserve (The files you want to preserve are in the other three partitions).
Once you have deleted that partition, that leaves the space it used to occupy as "unpartitioned space" on the drive. The Ubuntu installer will then use that unpartitioned space to create the partitions Ubuntu will use.
If you are still booted in the "liveCD" mode from the Ubuntu CD, the partitioning program in liveCD mode can be used to delete that partition (be careful to delete the correct one).
If you are back in Windows, then Windows disk partitioning utility can be used to delete that partition. Again, be careful to delete the correct one.