As was said in this very forum, the error may be related to the video driver or bad setting of the video card.

I have a dell inspiron R15 (N5010) with windows 7 home premium 64-bits.

First, I tried by re-running the assessment in the "Windows Experience Index" but problem remained. Second, I re-install the video card driver, even when it was up to date. After the latter, the problem never showed up again.

Problem solved !