One of the best features of Windows 7 is that it lets you create a repair disc so that you can use it when you encounter problems with the installation. You can use this recovery disc to access system recovery options.
Unfortunately, if your computer/laptop/netbook doesn't have a CD drive, Windows 7 will not allow you to create a bootable USB flash drive. so follow this guide on how to use this ISO.

1. Open Command Prompt with administrator privileges. To do this, type CMD in Start menu search field and then hit Ctrl + Shift + Enter. Alternatively, go to All programs, Accessories, right-click on Command Prompt and then select Run as administrator.

2. In the command prompt, you need to execute the following commands.
Type DISKPART and hit enter.

Now, type LIST DISK and press enter to see list of disks attached to your computer. In the next step, you need to select your USB flash drive that you are using to create system recovery drive (in this example, we are selecting Disk 1).

From now on, type all the following commands one by one and then hit enter (again, please make sure that you are replacing the DISK 1 with your Disk number).
SELECT DISK 1
CLEAN
CREATE PARTITION PRIMARY
SELECT PARTITION 1
ACTIVE
FORMAT FS=NTFS
(Format process may take few seconds)
ASSIGN
EXIT

3. Now, mount the downloaded repair disc and copy all the contents (contains three items) to the USB flash drive. You have just created a bootable Windows 7 recovery USB drive. Note that since this is an ISO, you may open the file using WINRAR then extracting the contents into your usb drive.