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Do Option 2 of this tutorial SFC /SCANNOW Command - System File Checker it will not harm any data or programs you have installed it will try to find and repair any corrupt system files that you have. You may need to do this up to 3 times with a reboot after each scan.
If you have other system files that you have edited for customizing this will undo it.
In the zip folder below is all bitmaps from explorerframe.dll with the buttons in it.
Jerry
Thanks a bunch! now it's back to normal.