hi Folks, purchased this 2009 Macbook Pro from a friend a while back. Most things work ok, but trying to install new applications or upgrade old ones, almost all seem to crash. I finally tracked down some older versions of Chrome and Skype; they work ok. Now I'm wanting to try out some of the Adobe cloud apps, and I just downloaded the Adobe Installer app, and it crashed too. Each crash is followed by one of those reports with all the techie mumbo jumbo in it. I've logged on as a different user, and the suspect apps still crash. I've repaired all file permissions from safe boot. No change. I've also run MEM TEST, a utility for checking RAM, from the command-line bootup and it was clean. The only success I've had, regarding a newly purchased version of Aperture, was to re-install the Lion OS, and then Aperture "took", but I can't go re-installing the entire OS every time a new app or upgrade crashes. My only solution seems to be to revert back to a 10.6 operating system. I'm currently running 10.7.5 on a 2.66 Ghz Intel Core 2 Duo, 4 GB of ram. Thanks for any suggestions ... !