A quick guide on how to install Visual Basic 6.0 with Service Pack 6 on Windows 10 64-bit. It took us weeks to get it working properly, so hopefully this will save people some time. Until MS inevitably breaks this procedure with an update, anyway. VB6 Install Wizard - http://nuke.vbcorner.net/ Service Pack 6 - https://www.microsoft.com/en-us/download/details.aspx?id=5721 The command you need to type to register DAO350.DLL is : regsvr32 "c:\Program Files (x86)\Common Files\Microsoft Shared\DAO\DAO350.DLL" Paste the entire thing including quotes into the 32-bit Admin command prompt. Common errors fixed by this tutorial (to help people googling) - 01:39 - "You must first run the installation wizard" is cured by editing the Registry 02:15 - "Visual Basic 6.0 Professional Setup was not completed successfully" is fixed by rerunning the installer with no options selected 03:01 - "Can't find file DAO350.dll" is fixed by manually registering it 03:23 - "Unexpected Error; quitting" is fixed by copying the DLLs from the VBA folder in "common files\microsoft shared" to the main VB6 program folder 03:43 - SP6 fixes the "Object Library not registered" error when attempting to add certain older OCX files, for example RICHTX32.OCX (Rich Textbox Control) and MSCOMCTL.OCX (Windows Common Controls) 03:53 - Running a repair install fixes the "Visual Studio 6.0 Service Pack 6 Setup was not completed successfully." error you get immediately after clicking the license agreement for SP6 install 04:26 - Adding the installdir to the 64bit registry fixes the error where you install SP6 (version 9782 / 6.0.9782) but it stays at the old version (8176 / 6.0.8169)