Thanks for that. It's in process. Hm, so when it's done, will I be able to install Windows from my this ISO file? If so, can I install windows on partition C (the one with current system on)?
Yes you will be able to install it. And you should be able to install it on the same partition, but if you have a deeper issue than making an ISO maybe you should consider posting about it in the appropriate forum.
Another thing that I should have added is that you should check the verify box before burning. Some have found this helpful and if you have a problem with the DVD i would do it over, making sure you check the box.