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Instacal driver for PCI-DIO24 - Windows cannot verify the digital signature



I'm trying to use a PCI-DIO24 board in a Windows 7 machine. I installed the Instacal 6.73 which included a driver for the card. Windows recognizes the card but is reporting "Windows cannot verify the digital signature for the drivers required for this device". Instacal runs OK but doesn't see the card.

Any idea how I can get this working?

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