Win7 system score appears "can not measure video playback performance" solution

After updating the graphics driver, we often prompt to update the “Windows Experience Index”, but it may pop up “Detecting the performance of video playback” when it detects the performance of Windows media decoding. One of the reasons for this problem is Either the page file is set too small, or the page file is put into the virtual disk virtualized by the ramdisk, and the small face is told to solve the problem.
Case 1:
Since changing a graphics card, the previous HD2400 was replaced by HD6570 1G DDR3. After the driver is installed, the refresh score in win7 is after the Windows media decoding is adjusted. “Video playback performance cannot be measured”. .
Case 2:
The system cannot be graded after reinstalling the system. It cannot be graded after installing the decoder update driver.
Workaround:
C: Windows System32” msmpeg2vdec.dll”, “msmpeg2adec.dll” and “mfds.dll” These three file names have not been modified, as modified , restore to the above name, you can. Generally, these three file names are changed to be followed by *.blk. It is OK to modify it.