I have an old Acer Aspire 5535 with Windows 7 on it that my son use to use several years ago. It seems really slow and makes a lot of noise so I thought I would reset to factory setting. I read in many places telling me to hold Alt+F10 when the computer starts up. I've tried it many many times but it doesn't work. I tried pressing Alt key first and tapping F10, tried holding it down together, tried pushing it at all different point of startup but it hasn't worked. Many times, it starts beeping repeatedly. I don't know what to do. Can anyone help and tell me what I am doing wrong? I don't have anything on this laptop that I need to save. Please help!