I know that, Imacri. My current problem is not "checking forever". The problem I meant occurs after installing some updates. Don't you get high CPU usage caused by TrustedInstaller after installing updates?
I only have a problem with the initial "Checking for updates..." phase hanging for hours during Patch Tuesday updates and constantly consuming 50% of my CPU (complete saturation of one core of my dual core). All this CPU is consumed by the Windows Update service (wuauserv) running under svchost.exe. Once "Checking for updates..." completes and reports that updates are available, the download and installation phases finish normally, as I noted in post # 16.
All users participating in ScousaJAY's Vista Forums thread windows update just seems to hang while checking see this same long delay for the initial "Checking for updates..." phase to run to completion, but subsequent problems with downloads and installations are not common and the CPU consumption usually drops back to baseline once the Windows Update session is finished.
It's normal for TrustedInstaller to run for a short period of time after Windows Update finishes the installation phase. The article How to resolve trustedinstaller.exe high CPU usage explains the CPU usage by the Windows Trusted Installer late in the Windows Update process:
"You may also find trustedinstaller.exe consuming a major portion of CPU resources for some time after new updates have been downloaded. This again is normal behavior. This process is designed to continue checking for new updates for some time after completion of the update scan. This, in turn, helps ensure that all available new updates are downloaded to your pc."
Here's a screenshot from my March 2016 Patch Tuesday updates showing TrustedInstaller.exe running at the end of the Windows Update session after 11 important updates were installed. The constant consumption of 50% of my CPU by wuauserv (running under svchost.exe) between the 90 and 35 min marks was the last hour or so of the "Checking for updates...." phase . The downloads, installation, monthly Malicious Software Removal Tool (mrt.exe) scan and final check by TrustedInstaller completed between the 35 and 10 min marks. The dark grey band at 10 min was the system restart, and once my system was re-booted the CPU returned to baseline.
32-bit Vista Home Premium SP2 * Firefox v46.0.1 * NIS v220.127.116.11 * MBAM Premium v2.2.1
HP Pavilion dv6835ca, Intel Core2Duo T5550 @ 1.83 GHz, 3 GB RAM, NVIDIA GeForce 8400M GS
Windows Update D Trusted Installer 11 Mar 2016.png 25.27KB
Edited by lmacri, 14 May 2016 - 01:27 PM.