Isobuster and windows 7 & Vista. Windows 7 not liking disks but Vista does

[BaPW]

I am using isobuster on some unfinalized dvds and on my 4 year old laptop running Windows Vista no problem. On my desktop running Windows 7 it does not want to at all. My desktop I have only had since this summer. It will finally say that there is a disk in it but trying to extract anything. Not happening or goes beyond slow so I give up. Isobuster does great with the Dvd-r files that the laptop does but not with the actual disk. I have tried two brands of disks, both Sony and TDK. No difference. I tried cd roller and the same thing. Does anyone have any suggestions of what I can to do so that I can use the desktop for the disks. Thanks