I just joined because after a week of working with Microsoft Support on the same problem I am still working on getting a two month old Dell back to normal.
Same as you Windows 7 Home Premium 64-bit SP1
Did Aug 9 Windows Update, all normal got 'need to restart to finalize'.
Hit restart, did not boot up, no start up repair, nothing just a black screen after the Windows Logo, no disk light, sounds or anything for over an hour. Called Dell, new therefor free and quick, support. Hit power button at their instuction, started to reboot, then:
Update Error 8000FFFF on all 10 updates
System Repair could not fix.
System Restore, all 16 points before and 4 after, all said could not fix. Went to bed.
Next morning, turn it on, boots up with no messages, but
All users gone except Admin
No users, even Admin show in control panel
Some programs work, some open installer andthe program siumutaneously, some just don't work.
Worked with MS Support for the last 8 days. They accepted it because it occurred during Windows Update.
Ran every FixIt and Hotfix they gave me, all fail with Error 2502 and Error 2503
Ran check disk, all fine
Ran my Kaspersky and three different malware checker MSsent to me, all clean.
Then they told me to run sfc /scannow
Shows 5 corrupt dlls:
sfc cannot fix
MS says do a repair install (I don't want to lose my business software, they are barely supported and the companies just want to sell me new packages that require monthly payments to replace my existing which is paid for)
Repair install gets to 99%,fails with message
Windows CouldNot Configure One Or More System Components, To Install WindowsRestart Computer and ReInstall.
I had already done a clean boot, logged in as hidden Admin, removed printer,etc. The system reset itself andcame up in it's old state.
MSSupport hadme rename the Software Distribution file and start again. It failed again and then the PC hung on restart, just like the first time.
Now no word in 4 days from anyone in MS.
All to leave me wondering as I watch my business shut down due to a Microsoft Update, should I have just replaced those dll's and then run sfc /scannow again a few times and let it repair that way.
I amjust like you, I don't know what to do now.