After installing microsofts's live photo gallery I ended up losing a lot of icons. I deleted the said software but still have not gained the use of the icons. I have also lost the the file icon for many programs, specificaly all the isocs that show that the file is a pdf file.
Have you opened My Computer, ticked on Tools, then Folder Options..., then the File Types tab, scroll down the registered file types window to PDF, single click on PDF to highlight it in the list, what are the Details shown below ?
Just wondering if the Live Photo Gallery program has taken over from the previously assigned programs to open some file types and you need to reassign them file types to the previous programs used for opening them.
Same with other file type icons that you mentioned you've lost the use of, maybe you could reassign them to their original opening programs by right clicking on the file and selecting Open with, pick their original program and ticking always open with, just a thought.