@Elfy, @coffeecat & @Bartender all have excellent suggestions that solve the OP's issue. All I need do is explain:
To Rick Campbell:
@Elfy & @coffeecat are providing instructions that allow you to see which of the partitions belong to your current 12.10 install.
will output something like the following (yours will be different):
will produce something like the following (again, yours will be different):
# /etc/fstab: static file system information.
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda1 during installation
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx / ext4 errors=remount-ro 0 1
# /home was on /dev/sda2 during installation
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx /home ext4 defaults 0 2
# swap was on /dev/sda5 during installation
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx none swap sw 0 0
In both cases, the parts that say "/dev/sda?" where "?" is a number will tell you which partition is being used by your 12.10 install. This is why you must invoke these commands while you are running your 12.10 system. Knowing which partition number is the one you want to keep means that you can delete the rest.
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 12G 3.0G 8.0G 28% /
udev 239M 4.0K 239M 1% /dev
tmpfs 100M 784K 99M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 248M 160K 248M 1% /run/shm
none 100M 8.0K 100M 1% /run/user
/dev/sda2 25G 5.6G 18G 25% /home
@Bartender's suggestion is somewhat different, but also quite valid. He/she is recommending that you nuke all of your Ubuntu/Linux logical partitions (which all reside inside partition #4--the extended partition) and just reinstall 12.10. This will allow GRUB to detect your Windows installation and set up one and only one clean pristine version of 12.10 for a simple dual boot machine.This has the added advantage of not confusing GRUB when it tries to find all of those missing older versions after their partitions have been deleted.
At this point, the choice is really yours. If you have lots of programs, data and configurations in your 12.10 installation, then you may find it less irritating to delete the partitions you don't want. If you don't have much of anything in your 12.10 installation, then you may just want to start fresh and follow @Bartender's instructions.