The problem with my system is with the MS-DOS,,, when I go there, the dos prompts open in a window and then when I expand it ( by clicking the four arrows). The Dos prompt open and everything works fine till I have o exit the Dos prompt.
When I have to return to windows I give the exit command then every thing goes balnk and then I have to reboot the system.
Even when I have to return to windows by Alt+Tab then every thing goes balnk and then I have to reboot the system.
If I use the Dos in the window then everything works fine.

Please, help me out.