Why Does Notepad Look Like This?

I was cleaning a virus off a friends computer when I noticed the letters at the top, File, Edit, Format, View, Help had white boxes around the words in Notepad.

Here's a screenshot:
http://img197.imageshack.us/img197/1167/44636487.jpg

I've seen this before when boxes are infected, but after cleaning them I see this go away, but this time it is still there.

Also the Task Manager looks the same too.

How can I fix this?

THANKS

 

Please try the procedure outlined here.