So I bought an Acer Aspire 5742G laptop.
I plugged in my drawing tablet and installed the driver.

Then I opened Photoshop with my tablet-pen and noticed,
that there were two flickering cursors on my screen at the same time.

They were ~2 inches away from each other and everytime I moved
the cursor with the pen or touchpad on my laptop, both cursors
moved along the exact same path.

Now that's not the big problem. The big problem is, that when I try do
draw something with the pen, it draws two big lines instead of one
normal line.
So basically my tablet just got useless...

I re-installed Photoshop and the tablet driver but nothing changed.
I tried to deactivate the touchpad, but I am not able to do that.

Do you guys have any ideas to help me out?