Hello I have a Sony Vaio desktop runnIng on wIndows vIsta pc Model PCG-2J1L and I recently had an issue with it starting. It froze and I restarted it and overtime I turn it on it takes me to the screen that asks to launch startup repair or start normally . When I start normally it restarts and takes me to the same screen when I launch the startup repair it loads then takes me to a black screen with an arrow . I tried pressing F10 to go to recovery center to reset my computer when I turn it on but it loads and takes me to the black screen with the arrow again I've tried booting at last successful boot but it takes me to a black screen that says operating system not found. Please help me , your help will greatly be appreciated . Thanks .