If someone would take up this challenge and attempt to solve it with me, I would appreciate it! I have troubleshooted for 2 days now to no avail. This is what happened: 1) I accidentally installed Safari 6.0, even if I have Lion 10.7. which doesn't run the new version 2) This disabled my use of Safari and my access to App Store 3) With a combination of AppDelete + Pacifist I tried deleting all Safari files, and re-installing old Safari 5.4 from scratch. I rebooted, repaired permissions and did a disk check. 4) Rebooted again, tried to open the newly installed Safari, but it gives an error: "Check with the developer to make sure Safari works with this version of Mac OS X. You may need to reinstall the application. Be sure to install any available updates for the application and Mac OS X." 5) At this point I thought to revert back to a previous point in Time Machine. Unfortunately all the points in Time Machine somehow showed Safari 6.0 (even a month-old points), so reverting back to an old point didn't help. 6) I try logging into AppStore to upgrade to Mountain Lion, but I can't do that, since it needs Safari to run and I don't have a Safari anymore! 7) Now I tried re-installing Lion from restart + cmd+R, and it asked for Apple ID to start the installation. --> At this point I am getting desperate, as this computer was purchased second-hand, so I don't have the Apple ID used to install Lion! 8) I try searching for Apple's official support, but obviously my warranty has expired, besides it's based in another country so they can only call cellphones from that country! So I cannot enter App Store; reinstall Safari; reinstall Lion; or upgrade to Mountain Lion. I have no access to Apple official support. I currently work in a developing country with limited access to any MAC support. I don't know what to try anymore! - How can I enter App Store without Safari? - How can I reinstall Lion without the original Apple ID? - How can I upgrade to Mountain Lion without App Store? I'm STUCK! Please help!!