I am the administrator on this computer, and every time I try downloading something from Software Updates it tells me I don't have appropriate access privileges. It didn't used to happen, and I've gotten by fine this year because I haven't had to download anything urgently. Now, I really need to download Mac OS X Update Combined 10.5.7, but it says "you do not have appropriate access privileges". Also, although it tells me that I can try again by finding the installer package in the finder, the package does not exist on my computer. I've gone to system preferences, the only user checked to administer is me, and I don't see any other option that could fix the problem... Any help?