The Disk Defragmenter is not installed on your computer

The Disk Defragmenter is not installed on your computer. To install it, double-click the Add or Remove Programs icon in Control Panel, click the Install/Uninstall tab, and then follow the instructions on your screen.

To fix this problem, do this:

Start à Run à regedit

Then follow this directory:

HKEY_LOCAL_MACHINE

SOFTWARE

Microsoft

Windows

CurrentVersion

explorer

MyComputer

DefragPath

Then change the value default from the right to %systemroot%\system32\dfrgui.exe

Then restart you computer.

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How to undo a system restore

If you mad a restore to your system and you want to undo the restore do these steps:

1-    Go to the control panel

2-    Click on system icon

3-    From the left choose advanced system sitting

4-    From the window which will appear choose system protection

5-    Make check mark on (undo system restore)

6-    Click next then select the created restore point  

7-    Click next, Yes then Close.

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