|Go to Program Files (if you have Windows 7, it'll be in Program Files (x86)), and find the SelectRebates/ ShopAtHome file (sorry I don't remember the exact name, but it's one of the two... you'll recognize it when you see it). Once you find the file, highlight it and delete it. I like to press Shift + Delete to delete it right away instead of it going to my Recycle Bin.|
When you try to delete it, you may get a notice saying that a file is still open. Simply pull up your Task Manager, select the "Processes" Tab, and search for SelectRebates/ ShopAtHome (again, I don't recall which one, but it's one of the 2 and you'll recognize it when you see it). Once you find it, highlight it, and click "End Process".
Now you can go back to the Program Files, and delete the file from there.
Good Luck! :)