How to replace /home directory?

[joe at actionline.com]

Just installed kubuntu 12.10 (root partition only) to replace 12.04 on one
of my computers, and made sure to preserve (not write over) the
pre-existing /home partition. But now I have a new /home directory inside
the root (/) directory, and the original /home directory is not mounted.
fdisk -l shows this:

Disk /dev/sda: 100.0 GB, 100030242816 bytes
255 heads, 63 sectors/track, 12161 cylinders, total 195371568 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x282d282d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848    61794303    30793728    7  HPFS/NTFS/exFAT
/dev/sda3        61796350   195371007    66787329    5  Extended
/dev/sda5        61796352    67848191     3025920   82  Linux swap / Solaris
/dev/sda6        67850240    87379967     9764864   83  Linux
/dev/sda7        87382016   195371007    53994496   83  Linux

So, what is the best procedure to replace the newly created /home
directory and replace it with the previous (original) /home directory?
Both are ext4 and both have the same owner and group names.

Can I just add /dev/sda7 (the previous /home) to /etc/fstab (contents
shown below) and will doing that delete/replace the new /home directory? 
Or are additional steps needed?

joe at T60: cat /etc/fstab
# /etc/fstab: static file system information.
# / was on /dev/sda6 during installation
UUID=864ca0e6-f82c-4394-b497-012083b40115 /      ext4   errors=remount-ro 
0   1
# swap was on /dev/sda5 during installation
UUID=dc56632c-3c80-4f8e-87e1-2a1d65ddc281 none   swap   sw                
0   0

FWIW, 'df' currently shows this:
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda6        9611492 3895244   5228008  43% /
udev             1540144       4   1540140   1% /dev
tmpfs             620500     820    619680   1% /run
none                5120       0      5120   0% /run/lock
none             1551244      80   1551164   1% /run/shm
none              102400       8    102392   1% /run/user

Also, what is the procedure to mount /dev/sda2 (the windows7 partition) so
I can access certain files on that partition.