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How to downgrade from NI-DAQmx 9.0.2 to 8.7.1?

I have multiple LabVIEW versions on the same WinXP PC. After I have installed NI-DAQmx 9.0.2  for LabVIEW 2009, I have noticed that there is no support for LabVIEW 8 in NI-DAQmx 9.02. Because I need LabVIEW  8.0.1 at the moment , I have uninstalled NI-DAQmx 9.0.2 version and try to install NI-DAQ 8.7.1. But this is not possible, because NI-DAQ  8.7.1 installer shows everything red (i.e. new version already installed). How to solve this problem?  Thank you! Bojan
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Message 1 of 5

Hello Bojan,


Please checkout the post here:


I think you need to run msiblast to remove installation.

For cleaning your PC please contact NI support for your country.



Best regards,

Mark Jonas

NI Application Engineer

Czech Republic and Slovakia 

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Message 2 of 5

Hi Bojan,


I believe that you haven't uninstalled everything from your computer. Can you please create report from MAX to show us what drivers and versions you have still installed on your computer?


I will try to setup PC to see if there is some problem with uninstalling DAQmx 9.






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Message 3 of 5
I had to solve this problem by creating an XP virtual machine and installing the older versions of LabVIEW with an older set of drivers on it.  That way I could still use LabVIEW 2009 on my new projects and still go back and support the older applications when needed.
Randall Pursley
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Message 4 of 5

Hey guys,


it is strange, but I just downgraded NI DAQmx 9.0.2 downto version 8.7.2. I have LabVIEW 8.6.1 and Visual Studio 2003 Express, and I tried it on Microsoft Virtual PC with Windows XP.



It is weird.  But I think, that for some reason uninstallation didn't go well in your cases. I believe you had more related drivers or software installed, and not everythink was removed. Therefore, I think to clean your computer as was suggested before would be great. However, It takes some time Smiley Indifferent




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