Toshiba Laptop Cursor is Frozen and Won't Work

Hello! I have a Toshiba laptop that I've had for about 2 years. The cursor has recently became frozen or disappears altogether. I've tried using F5 and it does nothing. I've turned my laptop on and off and it still won't work. I downloaded an antivirus software to make sure there wasn't some sort of virus on my laptop preventing the mouse from working as well, and that still didn't fix it. I've discovered if I hold down the left click button and drag, the mouse will work, but that's the only time and it's extremely aggravating. Does anyone know anything else I can do that I haven't already tried that will solve this problem? Please help me if you can. I need my computer for college and I have things I need to do ASAP, and this cursor situation is preventing me from doing it. Thanks in advance!