I have a Dell Studio 1535 laptop. Yesterday, I managed to install Mountain Lion on a virtual machine in VirtualBox using iAtkos ML2. Except graphics card, everything else works well, Sound works well, App Store works. Apart from graphics, I have another big problem: I can't install .dmg files: they get mounted, but then in the shown dialog box, everything is gray out, it looks like part of the background, I simply can't click on it as I do with a button.
By the way, the graphics card is Radeoon Mobility HD 3450 (I guess), and the chipset is Intel GM965 (is it called northbridge in laptops as well?).
If you think I shall install another version of OS X, please menton the version you think has the least compatibility issues.
Thank you so much in advance.