Once it's done loading into C: Program Files, open it. But if the arduino software is zipped, you'll have to unzip it. (Here's how to do it: Open up another C:. Click on make new folder. On the first one you opened, double-click on the software for the arduino. Once it's opened, you drag the entire folder(( yes, the folder that contains the IDE)). ) Once it's done doing that, click on the unzipped arduino folder. Once you open that you should see a folder that says arduino. Right click on that. Click on create shortcut.
Plug in the Arduino to your computer using the USB cable. It should fail despite its best try. Go to Start > Control Panel > System and Security > Device Manger. You should see the words Arduino Uno (or whatever you're using) Right Click > Update Driver Software > Browse. Then browse for the arduino software in C: Program Files/Arduino/drivers. Click next (or something like that.) You're Done!!
Click on the shortcut you made earlier. Go to Tools > Serial Port > then use what ever COM port you're using. (You can check whatever one you're using by going back to the device manager > COM. Click on ones until you find yours.) Select what arduino board you're using.
Keep the arduino plugged in so that you can program it. Go to Files > Examples > Basics > Blink. Once you have that done, press the reset button on the arduino. Click upload. And if all went well, you should see the "done uploading" on the bottom of the IDE. Plug an LED into pins digital 13 and ground. It should blink. If not, then flip the pins around.