This is my solution to the same problem (I have a 9400GT and an EVGA+, also running 3 displays, nvidia driver 195 and latest display link driver).
1) disable the nvidia display driver in Services (startup manual)
2) edit the registry to TdrLevel 0 (google for details)
This does result in a bad wake from display off/sleep - but that is solved by hitting ctrl-alt-del, then click cancel.
I know this is a workaround, but it seems to be working...
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