How can I check if I am being hacked? I think I am!

I am very suspicious that I am being hacked....like the kind where they can watch your screen and see through your webcam. How would I go about checking to see if this is true? Is there a way?
My computer has been freezing up and three times now a message box has popped up with the icon of the yellow triangle with an exclamation point inside, but before I can read what it says or manually close it, it goes away......
Also, I had posted this question before, along with a similar post on here yesterday, and they were beginning to receive comments back, and now they're gone. I haven't deleted anything from here, so does apple remove my posts, or is someone else....?
Any help is appreciated. Thanks!

need_help45 wrote: ... if there is a way to find out if I'm being hacked.
Hacking of webcam control need not be a concern for Mac OS X users.
If you are using Windows, you are wise to be cautious and take every possible precaution against Windows' security weaknesses, whether running on a PC or on a Mac (and whether via OS X Boot Camp or one of the PC emulators that runs inside OS X.)
For OS X Macs, the only way I know to make the webcam "hackable" would be for you (or someone else who had access access to your Mac) to modify or somehow damage your Mac or its software. Unless an "administrator" of your particular Mac has installed, activated, and authorized Apple Remote Desktop or some other software for remotely operating your Mac, it is highly unlikely that anyone can be using your cam without your explicit permission and action.  The reliable way to prevent this is to carefully control physical access to your Mac so it cannot be modified.
However, if you are convinced that your Mac has unwanted software that you cannot identify, securely erase your entire startup disk.  Then reinstall a fresh copy (not from your backups) of OS X and all necessary apps and updates.  Finally, copy your important user data files to the fresh system from your backup to your fresh system.
Message was edited by: EZ Jim
Mac OSX 10.8.3

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