Deleting old dll-files?

When is it safe to delete old dll-files? With Duplicate File Detective, I've discovered that I've got som 820 MB worth of dll.

Are they not supposed to be touched under any circumstances, or can I start with removing those who at least three years has passed since the last access?

Fuck you, you fucking piece of fucking shit! I've noticed that I had a multitude of dll:s that hadn't been touched in years. I don't know what cluttered basement you live in, but normal people use to throw away the useless junk.

It's obvious that you don't know what dll:s are good for. Otherwise you would've told me. Actually, no self-proclaimed "computer guru" has any real knowledge about computers (or anything else, btw.) Only a force-fed pile of artcicles of faith. Someone told you that dll:s are important, so you never bothered to find out why.

P.S. Your own logic a bit revamped: "Can you explay how clothes are made? No? You can't? Oh, isn't it cold going around naked year out and year in?"