Apple installed 'stuff' pop-ups

Could use more information here. When are these appearing? No browser open or anything? Something just appears in the middle of the computer screen? Never heard of that before.

Check the startup items in your login preferences under your account in system settings.

Go into Screensavers in Sys Prefs and make sure you haven't checked RSS Screensaver or Random. This is coming from the Apple site. It's normal behavior for RSS --not that it's very pleasant to receive advertising as a screensaver -- if this is checked. Try a different screensaver, or you might also want to think about not using one at all. You can just check Display Sleep to kick in after a few minutes in Energy Saver. Works just as well.

Forgot to mention, you can select a different RSS feed there.

iTunes Helper Log in item is normal. I don't think it's coming from that. Did you try what I suggested?

Unchecking it doesn't do anything in 10.4.x, it's supposed to hide it from the Dock, it's there to see if you insert a Music CD, but if you want to remove it you highlight it & click the little minus icon.

I think WZZZ has your solution though! 🙂

This is really not so complicated. The RSS Visualizer is part of the System; you don't delete it. It allows RSS feeds to supply your screensaver. RSS feeds are direct feeds or links usually to a particular site, often, but not always, news sites. One of the possible RSS feeds to RSS Visualizer is from Apple. This is where the ads are coming from. _If you have Random checked, it will, among the other screensavers, use RSS Visualilzer. This is why you are getting the ads._

If you don't want the ads, you have several options: Uncheck Random and select a particular screensaver, but not RSS Visualizer. Or, check RSS Visualizer and select a different RSS feed, something other than Apple. (But this may still hook you up to someone else's advertising.)

Or don't use screensavers at all; use display sleep.

I told you everything you need to know. Read again. What don't you understand about uncheck Random and select another?