One common issue with older versions of AutoCAD and AutoCAD LT is the Windows 7 (and Windows 8) BEX error.
Problem Event Name: BEX
Application Name: acadlt.exe
Application Version: 18.104.22.168
Application Timestamp: 440adc1d
Fault Module Name: StackHash_4c0d
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Offset: 02a4cc4c
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033
Additional Information 1: 4c0d
Additional Information 2: 4c0d4d78887f76d971d5d00f1f20a433
Additional Information 3: 4c0d
Additional Information 4: 4c0d4d78887f76d971d5d00f1f20a433
The BEX error is caused by enhancements in Windows 7 and 8 which are supposed to stop hackers from hacking your system, and actually it works really well. The problem is that it works so well that legitimate older applications like AutoCAD and AutoCAD LT fail because they we're programmed at a time when the Windows 7 and Windows 8 security "no-no's" weren't alive, hence the problem.
Isn't it annoying when you get a .dwg file from someone via email? You can't see what it is until you double click the dwg file attachment and then wait for AutoCAD to start in order to view it? Well, Microsoft themselves realized this was an issue for their standard Office document types so since Windows Vista and Outlook 2003 you've probably noticed that they have incorporated various email file attachment previewer support for Word Documents, Excel, Power Point etc.
Now there's a tool which builds upon Microsoft's Email file attachment previewer system which allows you to quickly preview all AutoCAD specific file types inside of emails, without the need to open AutoCAD separately. It's called The Longbow Email Previewer.
It also works for all AutoCAD file types .dxf, .dwt, .cuix, .cui, .mnu, .rx, etc. It also includes support for non AutoCAD file types such as .zip files! So cool to be able to preview zip files inside of the email itself, check it out - this is a great tool to have.
Tip 6 - How to disable Windows 7 or Windows 8 64bit driver signing
When Microsoft introduced Windows 64bit, they knew they had a good chance to stop the security and crashing carnage that they had created with the very open and uncontrollable Windows XP platform. They were determined to rebuild their Windows operating system quality perception with their user base and stop the blue screen of death crashing problems that happened with the unverified Windows XP drivers. They did this by requiring that for Windows 64bit, all drivers must all pass the Windows Driver Verifier and also be digitally signed.
What this means is that only legitimate software vendors could really produce drivers for the 64bit for the future, and of course, this would indeed protect the user. However, if you have older applications, legitimate older applications, these would not run on 64bit Windows due to the new restrictions imposed.
Luckily, there is a way to disable the 64bit Windows 7 or Windows 8 driver signing verification checks so you can install your old Windows applications...
NOTE: If you are simply trying to install an older application on your Windows 7, the tool you need is the Longbow Reviver which you can download here
Here's how to disable the Windows 7 driver signing checks :
1) Click the Start menu, type "cmd" then when it appears, right click it and click "Run as Administrator"
2) Next, type bcdedit -set loadoptions DISABLE_INTERGRITY_CHECKS and then press Enter
3) Next, type bcdedit -set TESTSIGNING ON and press Enter
4) Now you should be able to install/run your application
You can undo the above by changing the options from DISABLE_INTERGRITY_CHECKS to ENABLE_INTERGRITY_CHECKS and also by setting TESTSIGNING OFF
Tip 7 - AutoCAD Users Upgrading to Windows 8 or Windows 8.1
If you are thinking about upgrading your currently Windows version to Windows 8 and are worried about not being able to run your AutoCAD anymore, then please read on.
Both 32bit and 64bit versions of AutoCAD 2008, 2009, 2010, 2011, 2012 and 2013 (missing sp2) require fixing with the Longbow Converter tool.
Some scenarios to consider:
Existing 32bit AutoCAD Users upgrading to Windows 8 or 8.1 (versions 2002 thru 2013 (missing sp2))
If you are about to upgrade your working Windows 7 system to Windows 8, then we recommend that you first uninstall all 32bit AutoCAD products before doing the upgrade. Once Windows 8 has been installed, just use the Longbow Converter to re-install your 32bit AutoCAD software as before.
Existing 64bit AutoCAD Users upgrading to Windows 8 or 8.1 (versions 2008 thru 2013 (missing sp2)
If you are about to upgrade your working Windows 7 system to Windows 8, then we recommend that you first uninstall all 64bit AutoCAD products before doing the upgrade. Once Windows 8 has been installed, install your 64bit AutoCAD products as normal then use the Longbow Converter to fix all 64bit AutoCAD 2008 thru 2013 Windows 8 issues.
Clean install of Windows 8 or 8.1 - installing AutoCAD 32bit
If you are doing a clean install of Windows 8, once Windows 8 has been installed, simply use the Longbow Converter to re-install your 32bit AutoCAD software as required.
Clean install of Windows 8 or 8.1 - installing AutoCAD 64bit
If you are doing a clean install of Windows 8 or 8.1, once Windows 8 has been installed, install your 64bit AutoCAD products as normal then use the Longbow Converter to fix all 64bit AutoCAD 2008 thru 2013 Windows 8 issues.