Tablet pc not touching correctly

i bought a tablet pc off ebay and it was fine for the first few days. then a few days later it started to have moving issues, when i dragged the mouse with the pen it would not move correctly. then i found out there was software in a disk with other stuff to recalibrate it and it worked fine for another few days, and then one day the tablet froze and I force shut it by powering it off, when i turned it back on, everything was fine but now every time i touch the tablet it moves to the corner and wont move anywhere else (but i can still use a mouse from usb), and i can click but only in that area, i tried recalibrating it but it didn't work all it did was change it to another corner

its one of these
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