It is good that you have provided the specs of your wife's pc. Ubuntu main seems to be following a direction that requires new hardware... although I am a bit surprised that unity 2d is also slow... I would suggest that you try a lighter version. If you want to stay in the ubuntu verse the I would strongly suggest trying xfce. Another alternative is lxde.
You don't need to reinstall anything, just type:
Code:
sudo apt-get install xubuntu-desktop
for xfce and select on the login manager
or
Code:
sudo apt-get install lubuntu-desktop
for lxde
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