This small tweak removes the faint glass steaklines in Windows Aero in all glassed areas including the taskbar.
Go to your registry and edit the DWORD32-bit entry:
Set the value to “0”, then restart your Aero. (Default hex value 32, decimal value 50)
To do that, I switched to Vista basic and switch back to my Aero theme. Alternately type these run the following lines in a command prompt (not case sensitive):
NET STOP UxSms
NET START UxSms
My window color sliders
From reading comments at AskVG: