EDIT: I'm going to go ahead and assume that uploading them to the exchange will get rid of all those 'invisible' memories and hopfully I'm won't bork my computer anymore then I have. If I assumed wrong, please correct me! and if I seem impatient, it's because I am, sorry! I totally know you guys have other things to do and I'm the LAST thing on your mind, so I'm not angry at you guys for not answering my question ASAP, because I'm not, and I'm not 12 I swear!
Also, I lol'ed for reals at your avvie Plum! I saved it to show to my sister because she too will lol.
Uploading them and downloading them won't change anything. The corrupted memories and other bits will all still be there, and it opens up the opportunity for you to bork other people's games if they download your house full of Sims. Installing occupied houses from The Exchange is pretty much a surefire way to destroy your game over time.
Edit: Chopped off some extraneous quoty stuffs.