Please tell us your objective and give your current system layout. If objective is to remove older versions of Ubuntu, then you must be sure how your system is set up so that you remove only those partitions that are not essential to 12.10 and Windows. If this is a virgin install of 12.10 with no prior Linux system, then there is nothing that can be removed.
Your stated approach is dangerous and will likely end in tragedy. When you boot from a Live-CD, every partition in your HDD is open to deletion. This includes Windows and Ubuntu 12.10. Therefore, you must first determine which are your indispensable partitions before even thinking about modifying them. Here are the steps I would recommend:
1. Back up all of your important data to an external drive/USB stick and check that the backup is good. This is by far the most important step. With a good backup even the worst screw-up becomes an annoying inconvenience whereas without a backup, it's a disaster.
2. In a terminal, type (or copy and paste) the following:
This should generate a file on your desktop with the name "partition_table" that contains your partition info. It will look something like the following (yours will look different depending on what and how you installed):
sudo parted /dev/sda print > ~/Desktop/partition_table
We are trying to understand your partition layout first before modifying or deleting anything.
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 105GB 105GB primary ntfs boot
2 105GB 205GB 100GB primary ext3
3 205GB 207GB 1999MB primary linux-swap
4 207GB 500GB 293GB extended lba
5 207GB 500GB 293GB logical ntfs
3. Post this info back to this thread. Either attach the file or post its contents.