Is your computer the next victim of the SVCHOST.exe 100% cpu utilization bug?
Microsoft has published article KB927981 that explains how your computer may become unresponsive when it is hit by an issue that can affect system performance during software updates.
Symptoms are that your computer is veeery slow after startup and if you check running processes on your computer with Windows Task Manager, you will see an svchost.exe 100% cpu utilization process.
If you don't know how to start Task Manager, here's how: right-click an empty sport on your task bar and select "Task Manager" from the menu. Alternatively, you can hit ctrl-alt-del and click on the Task Manager button.
In the Task Manager windows, click the "Processes" tab to display process information. You can click on the column headings to sort processes.
Microsoft says that this is a rare problem and that only few computers are affected by the svchost.exe 100% cpu utilization bug. Judging by the number of discussion forums posts on the internet though, more than a few people are affected by this bug. (There are also a lot of people reporting svchost.exe with 99% cpu usage, but the outcome will be the same: an unacceptably slow computer.)
The problem should be fixed now and your computer performance should be back to normal.
Although a lot of people reported that this tactic has solved the problem for them, we know of a few incidents where people had to disable Microsoft Update and revert to using Windows Update.
Here's how they did it: