If it was downloaded through NI Package Manager, uninstall and reinstall PXI Platform Services . Otherwise, perform a force reinstall.
On a Windows system:
1. Test the chassis on another computer or controller if available and note any changes. The goal being to limit the hardware specifically the MXI or controller system that is causing issues2. Confirm that the behavior can be replicated with an empty chassis3. If using a MXI-Express connection, test a different PCI/PCIe slot 3. After this, confirm if the chassis or cards show up in Windows Device Manager4. Then go ahead and navigate to the directory C:\Windows.5. Move the pxisys.ini. and pxiesys.ini to the desktop or rename them. (For example, you could rename pxisys.ini to pxisys_old.ini.) You may only have pxisys.ini or pxiesys.ini. If both exist, ensure that both .ini files are moved or renamed, as in some cases moving just one (such as pxiesys.ini)may not resolve the error. 6. Restart the PC and launch MAX. This will cause PXI Platform Services to find the installed devices again and also recreate the pxisys.ini and pxiesys.ini files.On a PXI Real-Time (RT) System or Dual Boot PXI Controller, you will need to remove the pxisys.ini file from the /NI-RT/SYSTEM/ folder. You can do this by doing the following:1. In Internet Explorer, go to ftp://xxx.xxx.xxx.xxx/NI-RT/SYSTEM/ where xxx.xxx.xxx.xxx is the IP address of your RT system.2. Click Page and choose Open FTP Site in Windows Explorer3. In the window that opens, locate and copy pxisys.ini (could be pxiesys.ini) to the desktop.4. Reboot the RT system. This should cause PXI Platform Services to find the installed devices again and recreate the pxisys.ini and pxiesys.ini files
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A valid service agreement may be required, and support options vary by country.