Visual Basic Applications run very slow in AutoCAD 64bit

If you use VBA inside of 32bit AutoCAD you will have noticed that it is around 1000x times slower when running the same VBA code inside of 64bit AutoCAD.

This is because AutoCAD 64bit ships with the 32bit VBA DLL in a separate out-of-process executable rather than loading the VBA DLL inside of AutoCAD itself. Therefore, a lot of marshaling is incurred communicating between the out-of-process VBA executable and 64bit AutoCAD.

Other issues you may be seeing: Run-time error ‘429’: ActiveX component can’t create object

Affected, all 64bit versions of (and variants of)

  • AutoCAD 2008 | AutoCAD 2009 | AutoCAD 2010
  • AutoCAD 2011 | AutoCAD 2012 | AutoCAD 2013
  • AutoCAD 2014 | AutoCAD 2015
  • AutoCAD 2016 | AutoCAD 2017
  • AutoCAD 2018
  • AutoCAD 2019

The Solution:

The best solution is to install 32bit AutoCAD on 64bit Windows, here are the affected versions along with their solution text…

Copyright 2019 (c) Longbow Software

Installing 32bit AutoCAD 2008 on Windows 7, Windows 8 and Windows 10

These instructions solve issues around installing/running your old AutoCAD 2008 on newer versions of 64bit Windows 7, Windows 8 and Windows 10.

Some more common issues stopping you from using your AutoAD are error messages like these…

“This operating system is not supported by AutoCAD 2008”


“FATAL ERROR: Unhandled 0x… Exception…”

You can solve all the problems with your AutoCAD 2008 automatically by using our Longbow Converter App, it fixes and manages the AutoCAD 2008 installation so that you can be up and running again.

How to install AutoCAD 2008

  1. Obtain your purchased copy of the Longbow Converter here
  2. Start the Converter App
  3. Insert your AutoCAD 2008 CD into your CDRom drive…
    1. Select the 1st tab named “AutoCAD 32bit Installer Converter
    2. Using the “. . .” button, select your AutoCAD 2008 installation CD
    3. Next, click the “Convert button and follow instructions
  4. Once the conversion process is complete
    1. click Install/Run Setup to start setup
    2. Simply install as normal, remembering to…
      1. Fully close the AutoCAD setup application once complete
      2. Do not reboot, if prompted
      3. Close the Converter App.

Installing the AutoCAD 2008 Service Packs

Installing AutoCAD 2008 sp1

  1. Download the Download the AutoCAD 2008 sp1 zip from here (autocad2008lockedsp1.exe)
  2. Unzip the zip file and simply run the autocad2008lockedsp1.exe – 32-bit as normal


– If you are unable to activate your product, or the activation process crashes:

– If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

Copyright 2019 (c) Longbow Software

Solving the AutoCAD Failed Installation, Aborted 1603 error

If you are receiving a 1603 error when installing AutoCAD, something like:

  • Install Microsoft Visual C++ 2005 SP1 Redistributable (x86) Failed Installation aborted, Result=1603 or
  • Install Microsoft Visual C++ 2005 SP1 Redistributable (x64) Failed Installation aborted, Result=1603 or
  • Install Microsoft Visual C++ 2008 SP1 Redistributable (x86) Failed Installation aborted, Result=1603 or
  • Install Microsoft Visual C++ 2008 SP1 Redistributable (x64) Failed Installation aborted, Result=1603 or
  • An error occured during installation of assembly Microsoft VC80.CRT version=…..

Here’s what you need to do:

  1. Open your Control Panel, click Programs and Features
  2. In the top right part of the Programs and Features window, there is a search box, search for ‘Redistributable‘ then press Enter
  3. Now uninstall all of the ‘Redistributable‘ entries that relate to your specific error, e.g. if you get a 1603 error for Microsoft Visual C++ 2008 SP1 Redistributable (x64) then uninstall that
  4. Once you have uninstalled all of them, now try your AutoCAD installer again…

Error code 1935 when installing AutoCAD 2008

If you are getting Error 1935. An error occurred during the installation of assembly ‘Microsoft.VC80.OpenMP.type=”win32″.version=”8.0.50727.42″ when installing your AutoCAD 2008, try these steps to resolve it:

  1. Delete all files (*.*) from your C:\Windows\System32\config\TxR folder
  2. Next start a cmd.exe prompt in administrator mode, then type at the command line:

    fsutil resource setautoreset true C:\

  3. Now Reboot
  4. Next install all Windows updates, rebooting until there are no more Windows Updates left to install
  5. Now try to install your AutoCAD 2008 again