Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to install windows 7 using pen drive [title] Create an iso from your installation disc (if you have one). [step] The easiest way to create an installation usb drive is to use an iso, or disc image, of your windows 7 installation disc. If you have your disc, you can create your own iso in just a few minutes.

Ending1: If you don't have your windows 7 installation disc, see the next step. [substeps] Insert the windows 7 installation disc into your dvd drive. Ending2: [title] Navigate to " system preferences " and click on " drivers " on the startup menu. [title] Navigate to " the control panel " window, and click on " display " (applications, features, and add-ons). Ending3: [title] Open notepad tool and input your 32-bit patch amount. [step] Under notepad function, input your patch amount using the graph tool following the graphs tab. Ending4: [title] Insert your usb drive into the same drive you've just created. [step] The drive will send your copying file to the computer.

Answer format: ending1/ending2/ending3/ending4