I know there are a lot of people have laptop or netbook without a DVD drive. So if you want to format your machine it will be a nightmare. So i will give you a short step by step guide on howto create a bootable USB Windows 7 installer so that you can install your Windows 7 onto your laptop or netbook even if you dont have the DVD drive.
What you need.
a) Windows 7 DVD of course!
b) A 4GB USB Thumbdrive
You can only create a 64-bit Windows 7 bootable USB flash drive if your current Windows 7 installation is also 64-bit.
You can create a 32-bit Windows 7 bootable USB flash drive if your current Windows 7 installation is 32-bit or 64-bit.
Format the 4GB USB Thumbdrive.
Then open a command prompt and run as adminsitrator.
Type the following command and wait till the command execute successfully before moving on to the next.
2. list disk
3. select disk x (x is the usb drive letter)
5. create Partition primary
6. select parition 1
8. format fs=ntfs
Copy all the content from your Windows 7 DVD into your C:\Windows 7
Then open a command prompt (similar to step 2) and
goto C:\Windows 7\boot
bootsect.exe /nt60 x (x is the usb drive letter)
Copy all content from C:\windows 7 to your usb thumbdrive and you are ready !!!
You can use this usb to install Windows 7 to your laptop now!!!