Best is to use a professional data recovery service.
Some photos will be permanently lost since new software was installed.
Some photos should be possible to save, but it requires that no (!) more disk writes are done to that disk, since very single change may corrupt more data.
Yes, there are lots of data recovery tools out there. But even if they are good, they should be used by someone who have the skills. Alas, I have to assume that you do not, since you
1) created this thread.
2) didn't have multiple backup copies at different geographical locations.
3) didn't use user access settings to keep your things behind lock.
It really is <u>paramount</u> that data are not stored on a single disk or even at a single location. It will result in small or large losses. It's just a question of when. And the "when" is normally when it will hurt the most.
Professional help will cost. But you really have to go that route. Just downloading and/or installing a data recovery tool will destroy information on the disk. So download must be done on another computer and the recovery must then be done by either booting from a USB memory or CD, or connecting the disk (strongly recommended read-only) to another computer.
