Actually, I remember to use IDCC on this board recently.
Before installing the software IDCC, update your bios version of the board, preferably use the recovery method or F7 method if present.
Then download the IDCC version 22.214.171.1248.
Note: this is still beta version.
Hope this helps a bit.
I am running latest BIOS SGP4510H.86A.0121.2009.0828.1117
and the current IDCC version you mention 126.96.36.1998
and IDCC DOES NOT WORK on DP45SG. Times out on XTU service which gets hung up in "starting" state. XTU -> Extreme Tune Up service.
Yeep same to me..