In the past, I've written about both high CPU utilization by SVCHOST.EXE as well as the 0x8ddd0009 Windows Update / Microsoft Update error, so I thought I would mention this...
MS KB 932494 (When you use Automatic Updates to scan for updates or to apply updates to applications that use Windows Installer, you experience issues that involve the Svchost.exe process) references problems that are addressed by MS KB 916089 (FIX: When you run Windows Update to scan for updates that use Windows Installer, including Office updates, CPU utilization may reach 100 percent for prolonged periods) and MS KB 927891 (You receive an access violation when you try to install an update from Windows Update after you apply hotfix package 916089). However, even after applying the patch associated with 927891 (which replaces the patch associated with 916089), 932494 indicates that the following problems remain:
1) Certain 100 percent CPU issues are still present when you use the Svchost.exe process.I (as well as others) have speculated in the past that 916089 (and its succedent patches) can also help with the 0x8ddd0009 error message that one might receive from Windows Update / Microsoft Update.
2) An access violation may occur in the Svchost.exe process.