Install Microsoft Updates without user interaction screens appearing by using a command line switch.

Use the /quiet switch to install Microsoft Hotfixes in “Quiet Mode”

For example, I downloaded a hotfix from Microsoft and saved it to my Desktop. So I ran the command:

“C:\Documents and Settings\username\
Desktop\WindowsInstaller-KB893803-v2-x86.exe” /quiet

NOTE: This works if you have version 5.3.24.3 of update.exe and later. For earlier versions, you can use the /q switch instead.