I was in Finder and saw a bunch of files under the search for folders on the left hand pane. There were more than 10,000 files in folders named today, yesterday, past week, all images, all movies, all documents, and I assumed that these were just history items so I selected everything and sent them to the trash. Now when I try to open any application, it says that it's in the trash and can't be used until I remove it from the trash. Have I completely trashed the system? Is there any way to put all this stuff back where it belongs so that programs will work again? Apart from the applications, there are thousands of odd files of all sorts in the trash now. Are those also necessary to get the applications to work again? I can't begin to guess where they all need to go. As you can imagine, I'm new to Macs and don't know what I'm doing. In Windows, items in history folders are just shortcuts to the originals, so I wrongly assumed that it was the same on Macs and figured I was just tidying up the computer. I've spent the past three days installing a ton of programs and I don't really want to have to reinstall everything, and probably OSX, again from scratch. Please help. What can I do now???