Question

how can i format my laptop using pendrive

Answer 1

Download and install the Windows USB/DVD Download Tool (WUDT). This utility allows you to easily turn your USB drive into a Windows installation drive using the ISO file. You can download the program from wudt.codeplex.com. It will need to be installed before you can use it..step 1
Create an ISO from your installation disc (if you have one). 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. If you don't have your Windows 7 installation disc, see the next step.Insert the Windows 7 installation disc into your DVD drive.Download and install ImgBurn. You can download it for free from imgburn.com. Select "Custom installation" during the setup process and uncheck the boxes for any additional software. You'll have to do this twice.Launch ImgBurn and select "Create image file from disc."Select your DVD drive and click the folder button to create a file name and choose the location. The ISO file will be several GB in size. Give it a name you can easily recognize, such as "Windows7Install."Click the large "Read" button to begin creating the file. This will take a few minutes to complete. You'll be able to find your new ISO file in the location you specified.

If you don't have a Windows 7 installation disc, or you don't want to install ImgBurn, you can download the Windows 7 ISO file directly from Microsoft. You'll need your Windows 7 product key in order to get the download link, which you can find affixed to your computer, with your computer's documentation, or in your purchase confirmation email message.You can use NirSoft's free ProduKey to find your product key. You can get it fromnirsoft.net/utils/product_cd_key_viewer.html. Running this small program will display your Windows 7 product key.Once you have your product key, visit microsoft.com/en-us/software-download/windows7. Enter your product key and download the ISO file to your computer. This may take a while, depending on your internet speed.
step 2
Insert a 4 GB or larger USB pen drive into your computer. Make sure that you've backed up any important files, as anything on the drive will be deleted when you add the ISO
This may not be necessary, but some people have reported that this helps with errors with the creation process.Open your Computer/This PC window. You can find this in the Start menu, or by pressing ⊞ Win+E.Right-click on your USB drive and select "Format."Select "NTFS" from the "File system" menu and format the drive.