Any way you could point out which screws you are talking about? Is the "shroud" the silver upper shell with the MSI and Twin Frozr II text on it?
Sorry I didn't explain in more detail. The removal of the shroud looked pretty logical to me just given the pictures in the article I linked (screws for the shroud are on the bent around tabs and the screw heads appeared to be on the PCB side, hence needing to remove the entire heatsink to gain access to them). Good to hear you got everything taken care of. Enjoy!
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