problem on win8 tablet

[a1425367898]

I use ppsspp on my Dell Venue 8pro, and it works quite well.
But there's one problem. When I put my finger on the screen and hold down for a second, Win8 will recognize that as a right-click on the screen.
And，to the ppsspp, if you right click the Buttons XO口△ and LR，the Buttons will be pushed down and hold.Even after you lifted your finger.Just like this:
   
Is there anyway to fix this?
PS:My English is not good, hope you can understand what I said ↑.