Updated my mac to mountain lion 10.8.3 and now my app store, mail or facetime won't open. Also, I am not longer able to play videos through firefox. I tried downloading the combo for mountain lion and it refuses to install? Can anyone help me?

updated my mac to mountain lion 10.7.8.3 and now my app store, mail or facetime won't open. Also, I am not longer able to play videos through firefox. I tried downloading the combo for mountain lion and it refuses to install saying that I need to see developer. Whenever I try to open my appstore, mail or facetime it says that the programmes need to be installed and might not be compatible with this version of mac operating system. Can anyone help me?

It's not a bad install of Mountain Lion. I've had the same thing happen to me, but it affected not only Mail, but a variety of other programs including iPhoto and MS Office, where I had to delete preferences, caches, and reinstall the OS as well as the program itself. I'm still having issues with Mail, so I've gone to another program.
Everything was fine upon the initial install. I restarted my iMac about two weeks after the install, and that's when the issues began to happen. I've reinstalled Mountain Lion twice, but the same issues arise.
As I mentioned above, you'll need to figure out which preferences are causing the issue, then reinstall the program, as a fresh reinstallation will do you no good unless you wipe the drive completely.
Here's a thread that helped me with iPhoto:
https://discussions.apple.com/thread/4794375?start=0&tstart=0

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