Welcome to the forum:
Well, on my old XP to gain HD space I will/would ‘delete’ ( turn off and Reboot, then turn back on) “System Restore Points”
I would only do this when I was sure my OS was running smoothly and that I wouldn’t need an immediate “Restore”
Uninstalling and Installing software can result in “System Restore Points” to be set. This can/does result in HD space being taken up.
Not sure if this will help you, just my personal computing experience. 