Has anybody run into this SideFind thing?

It's annoying the hell out of me. It pretends it's a search engine, but it won't even offer any service. It just keeps popping open a side window. I think it's spyware or adware.

McAfee says it's in my System Restore files, but it says it's write protected so it can't do anything about it. I have four other things like that. I've written down the addresses and I opened one file, but there's a ton of stuff. Can I delete that whole file?

Update: for those of you who don't like to open comment sections, I explained what I eventually had to do to solve my problem in this post: On SideFind. But read the comments in both places.