I was trying to see a file using Notepad yesterday and, afterwards, every .exe program on my computer turned into a Notepad document. Files such as .doc and .png still seem to work, and when they are clicked they open their respective programs (ex: a Word document on my desktop opens Word). However, .exe such as Chrome and the File Manager do not, and I'm currently forced to use someone else's computer. I've searched around the internet and everything I have found suggested modifying the registry. Since they all give the same instructions, I decided I would try. However, they would all require the use of Command Prompt and/or Regedit, and I have discovered that they, too, have become Notepad documents.
Any help would be greatly appreciated. For the record, I'm using Windows 7.
Links I've looked up: