Okay, so I noticed that my hard drive was very full and got very interested/worried. I recently have duplicated a couple backups of GTA 5, it's a big game so I assumed it was just that. I ran CCleaner though and found over 100GB of so-called "tracker files". These, I'm pretty sure, are nothing to do with the extra copies of the game as they are still all there. No idea what these are but I'm assuming if I have this many there's a decent chance I've got some malware on my computer. Am I right in this assumption? I'm starting to lose faith in Avast anti-virus.
Open CCleaner. Go to Options and then select Advanced.
Select Advanced Report near the top (select it by placing a dot in it)
Close CCleaner.
Open Ccleaner again and do another 'Analyse'
What does it say now?
That is a lot of size in your recycle bin. Have you looked in your bin to see what they are?
What does it show if you select Run Cleaner, close CCleaner, open CCleaner and select Analyse again?