Touch Pad Vs Mouse

HI , I A USING MY MOM'S COMPUTER WHICH IS A DELL AND IS 5 YEARS OLD. SHE USED A USB PLUG-IN MOUSE. I PREFER THE TOUCH PAD. THE TOUCH PAD DOES NOT WORK VERY GOOD AT ALL. THE MOUSE WORKS BUT I REALLY HATE IT! I WANT TO BE ABLE TO USE TOUCH PAD, HOWEVER , THE RIGHT CLICK DOES NOT WORK NOR DOES TAPPING THE TOUCH PAD DO ANYTHING IN GAMES. I TRIED UNPLUGGING THE MOUSE AND THAT DOES NOTHING. SO I CAN ONLY COPY AND PASTE WITH THE MOUSE... WHAT IS WRONG? I HAVE SPENT HOURS TRYING TO FIGURE THIS OUT. PLEASE HELP!