Unable to open History Table or write History in TD12 TTUs when working on WINDOWS VISTA PC

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Unable to open History Table or write History in TD12 TTUs when working on WINDOWS VISTA PC

Friends,
We have recently got Windows Vista PCs. We have loaded TD12 TTUs. We are able to establish connection to Teradata Servers.
But it is not writing history.

Please guide.

Thanks.

Hrishikesh