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Accueil > Community > General > Error “REGDB_E_CLASSNOTREG” upon Startup > Reply To: Error “REGDB_E_CLASSNOTREG” upon Startup
![Adrian Giurca](https://www.weisang.com/wp-content/uploads/2016/09/default_avatar.jpg)
Hi Andreas,
installation problems can be sent even without support from the respective web site form: https://www.weisang.com/en/support/flexpro-support/
To answer your question:
The reported error messages are due to incorrect or failed installation of the VBA components.
Please look into the folder “%LOCALAPPDATA%\Downloaded Installations\FlexPro 2021 Suite”. If you find 6 folders with names like “VBA-*-x64” proceed as following:
Open a command line window (cmd) with administrative privileges and navigate to this folder with the command
cd /D %LOCALAPPDATA%\Downloaded Installations\FlexPro 2021 Suite
Each of the VBA-* folders contain a .msi installation file that can also be used for uninstalling the associated component with the following commands
msiexec /q /x VBA-Core-x64\Vba71.msi
msiexec /q /x VBA-CHS-x64\Vba71_2052.msi
msiexec /q /x VBA-DEU-x64\Vba71_1031.msi
msiexec /q /x VBA-ENU-x64\Vba71_1033.MSI
msiexec /q /x VBA-FRA-x64\Vba71_1036.msi
msiexec /q /x VBA-JPN-x64\Vba71_1041.msi
Now FlexPro can be uninstalled and reinstalled again to cope with this issue.
If on the other hands, the folders named “VBA-*-x64” are missing, please follow this procedure:
Open the registry editor (regedit) with administrative privileges and maneuver to the key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VBA\VBA7.1
In the subkey InstalledBy you find entries (beside (Standard)) for each program that installed VBA 7.1 (x64). The FlexPro entry has the key
{A9094AA5-B5F1-49F2-A5C7-8F0BFEE7DB35} (for FlexPro 2019)
{ED93C4E1-2948-4671-BAFC-FDD3BB014C23} (for FlexPro 2021)
If this is the only key, you can safely remove the key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VBA\VBA7.1
and uninstall and reinstall FlexPro.
Best regards,
Adrian Giurca