I've recently installed Windows 7 Ultimate SP1 x64 and there are more than 200 updates available, I let Windows Update download and install the updates but when the computer restarts, the logon (blue with logos) screen gets stuck more than five hours in the step 5 of 5 and it says "reverting changes". Finally when the update is "complete", only less of 20 updates were properly installed.
This happened two times (first time I got rid of waiting and used System Recovery), is a waste of time, I can't use my computer when Windows Update is working because svchost.exe and TrustedInstaller.exe uses more than 2 GB of system memory.
My system specs:
- Windows 7 Ultimate SP1 x64 clean install
- AMD Phenom X3 8400 at 2.1 GHz
- 4 GB DDR2 RAM
- ATI Radeon HD4550
- 360 GB HDD with 250+ GB available
Edit: After first trial, I've deleted SoftwareDistribution content, executed Windows Update troubleshooting package "WindowsUpdateDiagnostic.diagcab".