Method 1:

1. Type create system repair disc in Windows 7 Start menu search box and hit enter.
2. In the resulting dialog-box, select your DVD drive.
3. Insert a blank DVD into the DVD drive and then click Create disc button to start creating your Windows 7 repair disc. Wait for a few minutes to complete the burning task.

4. Once you have a Windows 7 repair disc, you can now create a Windows 7 recovery USB drive.
5. Plug in your USB flash drive and make sure that you have no data on the USB drive as we are going to format it.
6. Open the 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.
7. 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 a 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
ASSIGN
EXIT

8. Now, insert the previously created repair disc and copy all the contents three items) to the USB flash drive. You have just created a bootable Windows 7 recovery USB drive.

Method 2: Users who don’t like to burn a DVD can refer to this method.

1. Download the Windows 7 Recovery Disc ISO file.
2. Follow the procedure given in step 4 and step 5 (under Method 1).
3. Extract the ISO file contents using WinRAR or 7-Zip to your USB flash drive to create your USB recovery drive.
4. Before you restart your PC, you might need to enable the USB booting feature in the BIOS settings.