From your post, it's unclear why you mention an HP printer and Windows Installer.
Anyway, the first google hit I found was interesting.
- it was from somebody who explicitely said he did not have an HP-printer (which makes the mystery why YOU mention it even greater)
- he mentioned a windows installer file (that explains something about your post)
- he links to a possible solution. Worth a try, I think.
But the most interesting part is what he mentions as possible cause. He was stupid enough to run a registry cleaner. Did you do that also? Or do you have an idea about a possible other cause?
I have Windows 7 Home Premium 64bit and HP Photosmart Printer. Recent, when I start my computer, trayapp windows pop-up on my screen. How do I get rid of them. Someone told me to "disable" Windows Installer at the startup type drop-down box. Would this help?