[supersurfer]

They are there and unchecked, but I can't seem to see them in any other list, so I can't delete them. Is it because I have Windows XP? Or does that not matter...

[demlosers]

Have you terminated and restarted Spybot? If that doesn't work, check for a new detection rules update, there is a new one. Re-click the immunize button.

[demlosers]

If you use teatimer, terminate and restart that too.

[holymoly]

They are there and unchecked, but I can't seem to see them in any other list, so I can't delete them.

"Settings > Ignore Products":
"This page lists all products that Spybot-S&D can detect...If you check a product here, it will not be found during a scan."

It's a list of what Spybot can detect. It is not a list of what's on your system.