What do you mean by “its thread is iffy?” Threading was a big improvement in Vista as XP was largely a single thread of execution. Are you referring to kernel support for threading? (It most certainly is there.) Maybe you mean something else. I don’t know. What you list looks more like “hey look at me I know computers” jargon rather than something that actually makes technical sense.
For what it’s worth, you may want to look into HP as the culprit for that “patch.”
Try this one, load up IE, a chat client, MS Office 2003 with docs and exls files open, Blackberry manager, and Novell's Groupwise.
Now try and print a pdf to an HP network printer. Let me know when you get your print spooler error applet to shut down.