EDIT: It works again, somehow.
The screen went black while I wasn't using the computer, then it came back and I decided to check with PPSSPP again, it ran normally.
1.-My bad, Please and Thanks.
2.-It's a really old laptop, the CPU is an Intel Celeron B815 1.6Ghz with an integrated graphics card (shown simply as Intel HD Graphics in DxDiag).
3.-There wasn't any change between last night and today.
Please do note, that due it being legacy hardware, I can't update the drivers any further because Intel says so.