I am having a problem getting KB973923 to install on Windows 7 x64 RTM. Windows Update says it is installing it, but the progress bar does not move. I have waited for several hours and the update won't install. Pressing the "Stop installation" button in Windows Update doesn't do anything. I have to end the task named "atl80sp1-kb973923-x64.exe" in order for Windows Update to detect that the install failed. I had the same issue with the Release Candidate and was hoping it would be fixed in RTM.