von Mumit-
I agree with you on the registering point. I use a fantastic site called
Bug Me Not. You can visit it here:
http://www.bugmenot.com
As for freeware defrag programmes, there's only O&O that I know of:
http://filehippo.com/download_oo_defrag/
I don't think it's anything like as good as Diskeeper, but it costs nowt.