For your tablet to function again, you'll need the WACOM tablet driver which is NOT provided by Gateway, since they do not manufacture the tablet themselves.
You'll need the following drivers from the GATEWAY site to fix your button issue:
9524572.exe -
Gateway M275 Button driver, version 5.01.2600.2156
and from the WACOM site you'll need the Tablet PC driver.
-Go to www.Wacom.com
-Select your location and language on the right
-On the next page, choose downloads from the top navigation bar
-In Step 1 scroll down and pick Tablet PC
-In Step 2 choose your operating system
-Follow the download instructions provided on the site from there
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