Does anybody know how to fix this?

[Catgamer188]

I recently downloaded this "Legally obtained" copy of csgo, which I manually deleted.But after some some time I realized that I was missing about 30 GB of storage which i dont remember using.I go into the "Add or Remove Program" thing and CSGO pops up, I try clicking uninstall to try to get my 30 GB of storage back, but it shows this error message.I also have this problem for another "Legally obtained" copy of Half Life 2.I really need a fix to this, because almost 50 GB is alot of space in my eyes.

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