I'm trying to install an update to Firefox (from 2.0 to 18.104.22.168) and I'm having issues. I have an admin account, but when I try to copy FF to applications, it tells me it cannot copy because I do not have sufficient privileges for some items. Now on my old computer, it did the same thing, but when I logged into the first (admin) account created on the computer, I could copy things fine. Pain in the ass, but it worked. On this computer (brand new 17" C2D iMac), even if I log into the first account created and try to install from there, it still gives me a permissions error. Firefox is not the only application to give me this error (Skype is, as of now, the only other one) when I try to update. I tried running "repair disk permissions" from disk utility, but the same thing happened on both accounts after it claimed to make repairs. Anybody got any idea of how I might be able to fix this? Is there a chance that because I'm running antivirus software that could be screwing with the permissions? Or should I simply try to uninstall/reinstall Firefox?