Running windows 7 on a dell laptop since 12/09. While composing an email in Yahoo mail I hit some combo of keys, by accident, that shrunk the font to almost invisible., but only on Yahoo Mail and the other window I had open at that time, My eBay Summary. All other Yahoo and eBay pages display correctly. All other sites appear normal. Tried display & fonts in control panel but nada. Microsoft Geek squad has no answer. Looks the same running explorer or firefox but only those two places.