Problem with DVD ROM to install windows 8
I am using SONY VAIO Laptop, I want to change my OS from Windows7 to Windows 8 .
I have a windows 8 DVD of size 4.3 GB and I have a 4GB Pen drive, my DVD Drive is not working and the Pen drive is not enough.
So is there any way to compress the OS DVD further or any upgradation from 7 to 8 possible?
Please help me out.








