Gem is working in Pd Extended on Raspbian so maybe there's a way to do it in with Pure Data and Gem

Hi everybody,
I was just trying to explore the possibility to add Gem to Vanilla 0.47.1 under Windows 10 and I made some errors, Now every time i want to acced the startup section in the preferences I encounter the following error: and cannot enter the startup menu.
Is there a way to restore the default preferences?I tried to unistall a reinstall Pd with no luck. Where are preferences stored? I tried to delete every PD related entry in the config file, but nothing happened.
Thank you in advance

Hello everybody,
While opening the simple_texture patch in GEM examples I get these problems:

[glsl_vertex]: need OpenGL-2.0 (or at least the vertex-shader ARB-extension) to run GLSL

[glsl_fragment]: need OpenGL-2.0 (or at least the fragment-shader ARB-extension) to run GLSL

[glsl_program]: openGL-2.0 (or at least ARB shader extensions) needed for GLSL

I'm using a laptop running windows 7 and equipped with Nvidia Geforce 820m graphic card and the last version of PD extended (0.43.4)

Any idea on how I can solve this problem?

Thanks