How to get a list of installed hotfixes and updates
You can quickly collect this from the command prompt using WMIC (as long as you are using an operating system newer than Windows 2000).
This command-line utility (Wmic.exe) is used to access Windows Management Instrumentation (WMI) and saves you having to write a script to gather information by means of WMI. Wmic.exe can only be used by the local system administrators.
To collect the list of installed hotfixes, run something like:
WMIC QFE LIST FULL /Format:HTable > C:\Temp\HotfixList.HTM
and look at HotfixList.htm afterwards.