Copy file d2launch.dll to the installation directory of the program that is requesting d2launch.dll.
If that doesn't work, you will have to copy d2launch.dll to your system directory. By default, this is:
Windows 95/98/Me - C:\Windows\System
Windows NT/2000 - C:\WINNT\System32
Windows XP, Vista, 7, 10 - C:\Windows\System32
If you use a 64-bit version of Windows, you should also copy d2launch.dll to C:\Windows\SysWOW64\
Make a backup copy of the original files
Overwrite any existing files
Reboot your computer.
If the problem still occurs, try the following:
Open Windows Start menu and select "Run...".
Type CMD and press Enter (or if you use Windows ME, type COMMAND)
Type regsvr32 d2launch.dll and press Enter.

If you can't find windows directory try the following:
Open Windows Start menu and select "Run...".
Type CMD and press Enter (or if you use Windows ME, type COMMAND)
Type %WINDIR% and press Enter.

launch:

adobe_oobe_launcher.dll 2.0.0.36 230kb.	Adobe OOBE launcher Utility	28.03.2011
mediacenterweblauncherres (2).dll 6.1.7600.16385 (win7_rtm.090713-1255) 11kb.	Media Center Protocol Handler Resources	14.07.2009
adobe_oobe_launcher.dll 2.0.0.36 277kb.	Adobe OOBE launcher Utility	28.03.2011
fwlaunch.dll 2, 0, 0, 2 308kb.	FWLAUNCH DLL	30.08.2005
inlaunch.dll 14.0.6015.1000 394kb.	Microsoft InfoPath Launcher	21.12.2010
bcslaunch.dll 14.0.4750.1000 56kb.	Microsoft Office 2010 component	28.02.2010
wotlauncher.cfg 1kb.		14.09.2012
wotlauncher.exe 0.7.4.98 6852kb.	World of Tanks Launcher Built: 20120607 133428, Revision: #exist (stable)	14.09.2012
world of warcraft launcher.exe 1, 0, 0, 1113 1674kb.	World of Warcraft Setup	14.09.2012
launcher.exe 2.0.0.0 382kb.		20.09.2012
installlauncher.exe 1, 1, 0, 11 65kb.	Install Launcher	21.09.2012
gomtvstreamer_grlauncher.ini 0kb.		11.10.2010
grlauncher.exe 124kb.		22.03.2007
grlauncher.ini 0kb.		03.11.2008
jp2launcher.exe 10.5.1.255 34kb.	Java(TM) Platform SE binary	24.09.2012
jp2launcher.exe 6.0.200.2 23kb.	Java(TM) Platform SE binary	27.06.2012
launcher (2).exe 1, 0, 0, 0 66kb.	Uniblue Launcher	20.07.2010
launcher (3).exe 1, 0, 0, 0 66kb.	Uniblue Launcher	25.06.2010
launcher (4).exe 1, 0, 0, 0 310kb.	Uniblue Launcher	17.05.2010
launcher.exe 207kb.		29.11.2010

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