I have a question regarding Windows 8.1. Actually I purchased Windows 8 Pro last year. But there were some software compatibility issues with windows 8. So i had to go back to Windows 7 again. But as you know well that Windows 8.1 is coming & it's free for Windows 8 users as update. I wanna ask that can I download it separately from Microsoft and have a clean installation or every time i will have to install the windows 8 & then update it to 8.1??????