I just installed a new windows, but when i installed, i made some mistakes, I restarted the computer at the middle of the opperation, when NT installation was trying to install all the third party drivers and other supporting files, so i redo all the operation again and "another" Os is installed, though, when i start the windows, there was two options before the windows started, one is the fully installed window, another option was called "previous operation at c:" , that make the start up much slower, is any one had any idea how can i dellete that "previous peration"? thanks in advence!