I turned my other computer on today, which is running Windows Vista. The computer said it needed to scan disc C. I let it do that and then it loaded up; however, it gave me a black screen with a mouse pointer where I usually get the sign in screen. I've tried starting it a few more times but to no avail. When the computer was last working I was scanning with Malwarebytes' Anti-Malware and aborted the scan because I had to leave the house and didn't want to leave my computer on. Could anyone please help me?