Need new defrag program for Vista Ult 64
I'm need to replace the default defragging program for Vista Ultimate 64bit on my laptop, but don't know which one would be best or would actually work. I used to use Diskeeper on my my XP MediaCenter pc, but I can't get the new version to work on my laptop now. It claims it's 64bit compatible, but I can't get it to work for some reason. I know there are better ones out now since I last used this program, but don't know which to pick up now. Any suggestions would be great.