Cannot make firefox and acrobat default applications

Help please. I have tried everything I know to force my MBP to use Acobat and Firefox as the default applications for web and PDF, but to no avail, after I shutdown and restart, all reverts to safari and preview. I tried to change the application in "get info", I tried "default apps", nothing seems to work. Is this a problem with leopard or my MBP?
Thanks

HI,
Try repairing disk permissions and then do the Get Info window.
Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select FirstAid, then click: Repair Disk Permissions. Quit DU when it's finished and reboot.
Opening PDF files within Firefox
Carolyn

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