Lost or broken RunDLL32 executable? Here is how to replace them:

Step One: Download Correct Version

Right-Click the My Computer icon and select Properties. Select the General tab. Under the "System" category at the top, note your OS name as well as any Service Pack information. Compare it against the table below:

	OS Version	RunDLL32 File Version	Location
	Windows 95 (All Versions)	4.0.0.950	%WinDir%\system32
	Windows 98 / 98SE	4.10.0.1998	%WinDir%\system32
	Windows ME	4.90.0.3000	%WinDir%\Options\cabs %WinDir%\system32
	Windows NT4	4.0.1371.1	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows 2000	5.0.2134.1	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows XP SP1	5.1.2600.0	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows XP SP2	5.1.2600.2180	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows XP SP3	5.1.2600.5512	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows 2003 Server	5.2.3790.0	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows 2003 Server SP2	5.2.3790.3959	%WinDir%\system32 %WinDir%\system32\dllcache
	Windows Vista / SP1	6.0.6000.16386	%WinDir%\winsxs\x86_microsoft-windows-rundll32_31bf3856ad364e35_6.0.6000.16386_none_d5ce8f93adff8210 %WinDir%\system32
	Windows 2008	6.0.6000.16386	%WinDir%\winsxs\x86_microsoft-windows-rundll32_31bf3856ad364e35_6.0.6001.18000_none_d805518faaea92e4 %WinDir%\system32

Step Two: Replace On Local System

On the table above, you will note that each OS has one or two file paths. The first path may have been too long to fit on one line, so it may have run over onto the second. Each path starts with %WinDir%. In the order in which they are presented, copy the DLL (unzipped from the download) into the directory.