Shortcut Icons On Desktop Not Working - No Longer Able To Access Gmail

I think I may have screwed up royally with my still-new computer. Essentially, my problem is two-fold:

1) The shortcut icons on my desktop no longer work. I'm pretty sure I deleted the files from my computer (I'll explain in a little bit). Ex: I try to click on Mozilla, and nothing happens. If I attempt to send the same icon to the Recycle Bin, it will tell me that the file no longer exists. It says: "This is no longer located in "C: UsersKevinDesktop"

2) I am no longer able to access my Gmail. I no, I know that isn't a Windows 7 thing, but let me explain. When I go to Google in Internet Explorer and click on Gmail, I get a message that says "Internet Explorer cannot display the webpage." When I click on the "Diagnose Connection Problems" button, a box that says "A problem is preventing the troubleshooter from starting" appears.

So those are essentially my issues. Essentially, everything was working fine before I started messing with my files. Here's the scoop: This is the first computer I've ever had that had a split hard drive (C and D). I noticed that the D drive never had anything saved to it, so I decided that I would move my files that began with the pathway "C: Users" over there. I literally just clicked and dragged that over to the D drive. Then...I noticed stuff was wrong. The issues I mentioned before (shortcuts and GMail) and also that what little music I had on my iTunes was unable to be located.

I realized that it was probably that the shortcut icons, the iTunes songs were looking for files that had been moved...I decided to move them back. So I clicked and dragged the folder in D back over to C. It told me that some of the files already existed in C, and it asked if I wanted to merge them. I said yes. So. Problem still persists. I have figured it out with my iTunes and have got the program to locate everything, but I am still unable to fix the other issues. I can't find those files for the desktop anywhere, and I can't even begin to figure out what to do with the GMail issue, but I feel it has to be linked, right???