Hi, i have had the same problem. One way i found that helped me locating them is by allowing view of 'Hidden Files'. You can do this by going into your computer and finding Tools> Folder Options> View tab and check the feature that says 'View hidden files' . This should allow you to then go into your program files and view any files that you can see are taking up lots of space and delete them (only if you need to). Just be careful not to delete any important files that may be hidden just so they can be deleted.