I am very new to here, and am looking for answers to some of my problems, but....
I have encountered that wing ding font problem before. All the icons and such looked the same, so I clicked what I knew was the start button, moved pointer up to what I was sure was "All Programs". I remembered that "accessories" was my first program listed, so I moved to there. On my computer, the forth program group on "accessories" is "System Tools". Went there and the last option is System Restore, and started it.
My computer was still showing buttons, just not the words on them, so I clicked what I knew was "next". I had to back up a couple days on my calander to get it to come back with "real" letters.
I don't know if this will help you, but I thought I was the only one that had ever happened to. The only reason why I knew where all that was without the benifit of readable text was from all my trials and tribulations in my self-teaching of computers has caused me to visit the wonderful System Restore many many times.
Good luck...it would be great if I could help someone after all the wonderful info I have found on this site.