Hi, thanks, you pointed me in almost the right direction.... I repaired .net as you suggested and although this didnt quite fix the problem, I subsequently discovered that the WMI service was corrupt and so I've repaired the WMI service. It seems that a combination of this has resolved the issue. I am glad to have SP1 installing now as I have wasted 2 days of my life fighting with it :-(

Has anyone seen this error: Windows failed to install the following update with error 0x80070643: Windows 7 Service Pack 1 for x64-based Systems (KB976932). This is from Windows Updates. I've also downloaded the SP1 directly with no successful installation I've done an SFC /Scannow now with no errors also installed and run System Update Readiness Too for win 7 X64 KB947821.. I've also deleted downloads in the softwaredistribution folder and re-registered the wuapi.dll Apart from the eventvwr, whcih isnt overly helpful, what logs can determine where the issue lies and what can I do to resolve? Appreciate any input! Thanks :-)

You might try Method 1 under "Resolution" in the following KB: http://support.microsoft.com/kb/976982#method1 It's for .NET Framework updates, but the .MSI corruption fix-it may resolve corruption for other products as well. I'm not sure. It's also possible that .NET updates are what are failing during the SP install.

Hi, thanks, you pointed me in almost the right direction.... I repaired .net as you suggested and although this didnt quite fix the problem, I subsequently discovered that the WMI service was corrupt and so I've repaired the WMI service. It seems that a combination of this has resolved the issue. I am glad to have SP1 installing now as I have wasted 2 days of my life fighting with it :-(

Hi, That seems your issue has been resolved, and I will mark your reply as an answer, it could help other community members facing similar problems. Regards, Leo Huang TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedback here.Leo Huang TechNet Community Support