By default, this is:Windows 95/98/Me - C:WindowsSystemWindows NT/2000 - C:WINNTSystem32Windows XP, Vista, 7, 10 - C:WindowsSystem32If you use a 64-bit version of Windows, you should also copy speed.exe to C:WindowsSysWOW64Make a backup copy of the original filesOverwrite any existing filesReboot your computer.If the problem still occurs, try the following:Open Windows Start menu and select 'Run.' How to install speed.exe:Copy file speed.exe to the installation directory of the program that is requesting that doesn't work, you will have to copy speed.exe to your system directory.Type CMD and press Enter (or if you use Windows ME, type COMMAND)Type regsvr32 speed.exe and press Enter.If you can't find windows directory try the following:Open Windows Start menu and select 'Run.'.