We all know about the brand new feature "Windows Experience or Performance Index" introduced by Microsoft in Windows Vista and Windows 7. This new feature detects your computer hardware and automatically calculates a performance index or Windows experience index based on the hardware.
"Windows Performance Index" is shown in "System Properties" window which can be accessed by right-clicking on "My Computer" icon on Desktop and select "Properties" or by opening "Performance Information and Tools" applet in "Control Panel".
The index looks like following screenshot:
Sometimes when you open Windows Experience Index window, you get a blank window showing 2-3 lines or sometimes it shows absolutely empty. It doesn't show the performance details. Even it doesn't show any kind of help to fix it. So you are left clueless.
Don't worry. If you are also facing this problem, here is a solution to fix the issue:
1. Type regedit in RUN dialog box and press Enter. Now go to following keys one by one:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Control Panel\Performance Control Panel
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\Control Panel\Performance Control Panel
2. In right-side pane, if you see a DWORD value "PerfCplEnabled", delete it.
3. Close Registry Editor and restart your system and now your problem should be fixed.