Lost Hard Disk Icon

I was tinkering with my computer the other night. And this morning this came up:My hard Disk Icon(The One in My Computer when you open it, showing your computer contents, your hard drive, etc) was replaced by the one that windows shows when it does not recognize a file.When I tried to fix it, it became worse. Now when I double click one of my hard drives it will now not open but goes directly to the search function for that drive.My hard disk icon or whatever it is called, and b.) Double clicking the hard drive will now open it instead of the search function.I wanted to print screen the problem, so that you guys could see it but I don't know where the print screen image is located.