I need help getting my interface back

I purchased Adobe master collection CS5.5

When I opened my AI, AE, PSD ID  I noticed the font was changed. How can I

bring back the original font Adobe used (File, Edit, Window, View). I did all the reset default and all.

Nothing happened.

I am attaching an image hopefully the image you will be able to help me with my problem.

The top image is the original look of my interface (see the font use in menu --file, edit, view, window etc)

Now look at the bottom image the font changed to some horrible font

and it is hard to see.

Please help --I do not know what I am doing wrong.

I just want the original look back to all my applications (AI, AE, ID, PSD) etc

Thank you for your time and consideration,

CB

Please click the link to view the image  thank you:

http://cdn-2-service.phanfare.com/images/external/5175528_6182800_194319291_Full_2/0_0_e5e93d7fadaed21b68ab3843122d431a_1